These suggested improvements below are based upon my experience with a 2020 Land Cruiser Heritage Edition, combined with having owned Lexus LX and GX models in addition to previous model 100 and 200 series Toyota Land Cruisers over the past two decades:
1. Fuel fill on driver side (regardless of market served). Driver side on left, fuel fill on left. Driver side on right, fuel fill on right.
2. Smaller headrest for second row, middle seat - or option to securely store the removed headrest inside the vehicle when not in use. In the 2020 LC HE the headrest is full size (great for safety of passenger), which, when in place, is large enough to hide a small car or object as seen from the rear view mirror.
3. Headlights that track with steering direction.
4. Remote engine start/stop from key fob and/or mobile app.
5. Adjustable suspension similar to LX, both height and stiffness. Though it's understandable it's important to keep reliability top on the list, this option would be lovely.
6. A selectable 2WD option for city driving or highway driving when 4WD isn't needed (again, likely full time 4WD for fewer moving parts, but other manufacturers have figured this out).
7. Heads Up Display
8. Larger drink/bottle holders in door pockets
9. Panoramic sun/moon roof
10. Puddle lights for ingress and egress
11. Put Climate Control with the rest of the controls. The Climate button to control fan speed, four zone, etc. is separate from the other buttons such as Nav, Apps, and Phone. And/or provide a manual control for fan speed in the climate button cluster.
12. Compass heading readout in the rear view mirror.
13. Upgrade the tech. This is another vote for Apple Car Play/Android Auto from other posts in this thread. We are using technology in a 2020 vehicle that was developed in the last refresh half a decade ago. Please keep up with other manufacturers - or at least keep up with your Lexus sibling.
14. Option to stop the automatic hatch lift. Having the lift assist on the rear hatch is great until it crunches the hatch into the garage (or other low object just above). Being able to manually stop it would be nice.
15. Deploy the rear wiper from beneath the spoiler. Not only does it hide nicely away from view or the baking sun to prematurely wear/crack the rubber wiper blade, it also wipes snow off downward rather than up and over. Range Rover figured this out, as did Lexus.
16. Illuminated buttons on roof cluster. In the dark, one is left guessing which button is being pushed for a map light or any other control on the roof cluster above the rear view mirror.
17. Option to turn off the courtesy lights in footwells and doors.
18. Diesel option for the U.S. market. Pay attention to other domestic and foreign manufacturers who offer this option on SUVs (Range Rover, Jeep), and domestic manufacturers offering it on lighter duty vehicles (Chevrolet, Dodge). Yes, we want enough torque to pull a house and diesel is the answer. (Unless hybrid electric or full electric is discussed, then pay attention to Rivian.)
19. Interior Rear Hatch Open. This is a safety feature that will come in handy if the vehicle finds itself in water to allow occupants to escape when/if egress through a door is not an option.
20. A place for smartphones to sit on the dash or center console. Though the 'charging garage' in front of the shift lever at the bottom of the center stack on the dash is nice, it's awkward for when your passenger needs to put their phone somewhere.