I'm a big tech guy too. I have multiple vehicles from my '09 LX570 having the oldest multi-function display (MFD). For perspective, I have another vehicle with a custom integrated ipad directly in dash, and then the most advanced would be a Tesla. Yet I never feel like the LX (and LC of that vintage) is the most dated. Because I don't use its MFD in that way, and have my cell phone mounted high, right next to the vehicle display. All I need is a BT connection to the vehicle for sound (which is easily added to those year vehicles).
There's advantages to using the cell phone directly. It's always upgraded, with superior control and response to any car interface. The UI is the most comfortable as I use it outside of the vehicle every day. I've toyed with and installed VLINE and others in the past, but the result and usability is always disappointing in some manner, and I return to center which is direct interaction with my cell phone.
In regards to other feature differences between the LC and LX. Here's an evolving list. Note that as years progressed, the LC got more standard levels of equipment flowed down from the previous years LX. Yet the LX continues to get more features as it progressed as well. Some of these are minor, but some are significant and define the capability and character of the overall vehicles. Whether those matter to you is subjective, though this should help you better make a decision.
(Copied from here)
LX features:
1) Substantially more sound deadening
2) Powered rear hatch for open/close
3) Soft open rear lower tailgate, with power latching
4) Surround camera system
5) Ventilated/Heated front row
6) Mark Levinson
Reference (only other model to get the Reference system is the LS) w/surround
7) Power side view mirrors with auto-fold (I believe later LC's go this)
8) AHC - AVS, lift on demand, auto and multi-step damping, anti-dive/roll/squat, leveling, etc., etc.
9) AHC underbody armor
10) Shorter roof rack (LC has a longer roof rack with 3 supports per side)
11) Steering headlights (AFS)
12) Projector headlights ('16+ LCs got this)
13) Headlight washers
14) Storage in rear seat armrest
15) Power slide rear seats
16) Second row storage on front seatbacks is a panel vs net
17) 14-way adjustable driver seat vs 10-way LC (passenger 12-way vs 8-way)
18) Power stowage for 3rd row seat
19) All windows down by holding remote door open button for 3+ seconds (not sure Toyota's have this?)
20) Substantial Lexus key fob (LC uses same one as corolla)
21) Fade-To-Off interior lighting (I believe LC got this in 2014?)
22) Puddle and side step lights
23) Door sil lighting
24) Interior ambient lighting
25) Additional trunk side light and open tailgate lighting
26) +2hp / +2tq (requires 91 octane, LC is 87 octane)
27) More luxurious interior appointments
28) Ventilated outboard rear seats
29) Four-zone climate concierge
30) LED Headlamp with AHS Sequential Turn
31) LED Cornering Lamp
32) 12.3-inch high-res split-screen display (LC 9")
33) Head-up display
34) All-Speed Dynamic Radar Cruise Control (LC DRCC for 25mph and up)
35) Steering wheel paddle shifter
36) Door puddle projector lamps
37) Rear door retractable sun shades
38) 2020 gets special trims: "LX570 Sport" to "LC Heritage"
39) Dual screen rear entertainment