Come to Qatar
Let me take you out to the dunes and show you if the LX 600 is a real off road vehicle or a raV 4

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The LX 600 won't have less articulation than a 570 that's for sure, even without AHC, because that's the same suspension setup as the base 300 and that has excellent articulation. An actual ramp test would be an interesting test to do, maybe I'll do one someday!.
The LC300 being the flagship product, came first ( was the first TNGA-F product to be developed ), then everything else was developed around it.
The 250/300 will evolve and develop in the future and will without a doubt remain for future generations. I hear an all electric GX successor is already in the early development stages ( mentioned on some forums).
The question is, will the Sequoia last beyond this generation?
Sales are so low compared to the 150/300 and without a doubt the 250 will end up selling more than the Sequoia too. They saved the Seq from the axe once, will they do it again?
We still don't have full year Seq sales because it hasn't been exactly a year since it went on sale, but I really have a feeling it won't survive a next gen.
My guess is, the LC300 replacement ( LC400) will grow in size a little, not a lot but think Y62 Patrol/US Armada size ( and soon Y63 ). With the LC250 being 300 sized, I see room for that to happen now, especially since a lot of LC300 owners are actually complaining it feels to tight inside.
All I can say is what a time to be BoF Toyota fan.