I didn't read the full thread so may not be adding much but I wanted to chime in since I've now got about 80k miles on my '97 FZJ and I've previously owned many VW vans from splitties to Vanagons. I Full-timed in an '83 Vanagon for a decade, have traveled in most flavors of Vanagon including later model synchros, various conversions, etc.). Anyway, very familiar with that platform and think it's great in many ways.
When I got my 80 (2016) I closely considered 100s and 80s and had spent a lot of time deciding which way to go. I decided on a '97, locked CE as it was my fav. of the US spec 80s. I prefer the later odb2 rigs, enjoy the auto climate control and think lockers help justify care and feeding of the rig since you get higher resale if/when you move on to a different vehicle and of course they are there if you need them. I've driven it about 80k miles now and have no plans to replace it.
A big factor for me in deciding between 80/100 was that I wanted to own the LC indefinitely and planned to do most/all of the work on it. Keeping the 100 on the road long term was a less appealing to me but in reality it probably shouldn't be that big of a factor. AHC (LX only) and Brakes (LC or LX) seemed like the biggest mech downsides to the 100 platform though there were other differences like timing belt, integrated controls (later versions), etc that were less appealing in my opinion. Beyond the mechanical differences I prefer the overall feel of the 80 which was probably influenced by a vanagon being my primary vehicle when I was shopping. I think that a well sorted LX 470 is delightfully comfortable though but it's a pretty foreign/unmechanical experience compared to what I'm used to.
I've got young kids and can converse with them while cruising 70 down the road if they are in the 2nd row and speak clearly. We just finished a 6 hour drive an hour or so ago, occasionally in pouring rain, and talked most of the way without issue. 3rd row is a little harder regarding talking at highway speeds but is fine at lower speeds. I run Michelin XLT in 33" size so tire noise isn't a factor and my rack setup is quiet right now though at times it's been louder so a RTT may or may not be an issue here. I've added sound deadening to floors and doors and new carpet with a thicker backing though it didn't seem to make much difference. New door seals would help at this point as that is the largest noise source and rooftop insulation/deadening may help but I've not tried yet. I've got some hearing loss so am sensitive to cabin noise. My wife's lexus is noticeably quieter but the 80 is acceptable.
Safety and AC were the main reasons I got rid of the Vanagon Westy as it just didn't work with kids in SouthEastern heat with me worrying about being rear-ended on the highway. Not being able to communicate with the rear seat unless we shouted didn't help the Vanagon either. I've pulled a 3k lb camper around a lot of the US with stuff on the 80 roof, etc. It's slow at times but feels safe since the big rigs are usually slower when the 80 really struggles.
Overheating isn't an issue. Clean/sort the cooling system and tune the fan clutch and you can tow with AC on high in really hot ambient temps with no issue, etc. Maybe wheeling in the SW dessert summer could justify upgrades from stock but the OE fan / clutch setup can move a lot of air and will cover you with little worry if the system is in proper condition.
AC works great but it's dash vent only so you can get a little cold up front trying to keep the rear cool in really hot temps. Roof insulation and a mid-cabin circulating fan would help but we haven't needed to take those steps. I replaced all AC system components and recharged the sytem in my '97 and it blows really cold. It was acceptable before the full system overhaul but noticeably colder the last year or two since I did the full update. You can aim the vents to push air to the back without hitting front row passengers and my rear passengers stay comfortable even in our humid Southern Summers. The crotch vent is great
Cruise control works great. I had to tighten the cable per mud recs and now I use it most of the time when driving on the highway. The 1mph speed change with up/down bump means I drive without feet on the pedals most of the time
6'2" could be tight depending on where the inches are. I'm 6'1" and the 80 is pretty comfortable but there's no extra room in my opinion. I keep the seat all the way back and adjust the seat back angle based on driving conditions/preferences. The seat bottom angle is useful and can help shift the pressure points on longer trips. The stock seats aren't the best though but they are passable if in decent shape in my opinion. You may need the seat extension setup but it could cramp whoever sits behind you though I don't know about that from experience.
If you plan to tow a lot go ahead and get a 100 and don't look back I'd say. The 80 does fine for me on the East Coast but struggles out West at higher elevations. Camper options were more limited with the 80 but that was a compromise I was ok with. etc. though it sounds like you may not plan to tow anything.
The 80 makes a great solo camper I think without anything out back or on the roof. I've added a platform down one side and then use a single 3rd row seat on the other side in camp. Nothing like the Westy but camps well in my opinion. I've enjoyed moving to a trailer based camping setup though and not needing to decamp to drive anywhere/etc.
Good luck and sorry if this was a bit of a ramble. A Vanagon driver asking about 80s has a ton of overlap for me.
PS I just finished a weekend camping trip to see the eclipse with the family. We met up with the guy that bought my last Vanagon back in '16 so I just got to revisit that platform which brought back good memories but didn't make me want to go back to that setup

Pic from this weekend below.