We have the Executive, so everything Lexus could put in an RX at the time.
That being said, like you say the base has most of the good stuff.
I was looking at Executives at first as they all came with AEB and radar cruise, even the 2016's. Then we found out they came with the 360 camera, and my wife really took to that for parking and maneuvering. Combined with the front sensors she can wheel that thing around the city like her old CRV.
The rest of it is either just nice extras (big wheels, HUD, Mark Levinson, big nav screen) or things we don't use (Pano roof, PITA Nav system)
It had been sitting on the lot for a while and we got it just before Covid pushed used prices up so the price was pretty reasonable and not a lot over a base