The pano sunroof acts like a dutch oven in the Texas summers due to the fact that there's no radiant barrier when the shade is closed, it's often no more than a thin piece of fabric. I had mine explode in the Ford, it seems to be common on a lot of makes due to improperly tempered glass. I only like sun roofs when it's raining or overcast out, when it's sunny and hot the last thing I want is something that intensifies that.
In regards to the third row windows, I've never sat in the third row of any vehicle I've owned with them and I never intend to, so I could care less lol.
My very first experience with the brand was actually our family friends 100 series LX in gold somewhere around 98-99 in Houston and my friend and I climbing into the third row of his parents car thinking we had stepped into some dimensional portal of shrinking space and begging for fresh air through the quarter panel windows!
I wont be back there again myself either (and def wont fit anymore) but i don't want to put any kids through that LOL.
I totally get the heat build up thats why i always tint the sunroof in any car and good modern tint can do a lot more than people think.
I agree the translucent shades are not great but the sun is not always over head and that problem applies to all windows throughout the day.
Im not sure what tint you run but check out the specs on this one that i have installed:
It makes a HUGE difference and combined with even a sheer fabric you will not be feeling the heat.
It is even better IMO than my old huper optic german commercial grade ceramic i used to use.
In TX your car will definitely roast when parked most of the year but i don't think you will have any issues with heat while driving doing the above.
I don't at all with my sunroof shade open using just a low opacity tint where before it would burn my wife and I.
There are more interesting solutions to that out there though as we have seen on airplanes with selectable opaque electrified glass.
Thats got to be on a production car somewhere? RR, Bentley? IDK
These issues are why ive been upset with the missing venting since i switched from my 100 too. A pano roof would also help make up for it a bit.
Letting out that trapped heat before trying to tax the AC with cooling an additional 100 degrees is key and it helps tremendously to have a way to open the rear compartment. Or even the upward convection properties, or having the rear slit open slightly and not being noticeable to potential thieves etc.
I just wish we wouldn't lose functional, practical and cool distinguishing features with each iteration of the LC.
Trucks have sliding glass, 4 runners have the fully lowering rear glass and we used to have a third row vent (sliding window before that even).
Gaining a pano roof would be cool despite the drawbacks, although weight is always an unmitigable issue with them.