My point stands.
As said in the lx600 release thread, toyota didn’t care about that level of off-road performance in the 200 and they won’t the 300. From their perspective crawl will get you anywhere you should need to go in this SUV, and doesn’t require any hardware changes like lockers would. Their release video talked about going “off-map” then had a very well dressed couple serving drinks from a crystal decanter in a tent in the desert. That is who they are marketing toward, not the RTT crowd.
But primarily, it is because in the US 99.9% of actual buyers of new LX600s off the dealer lot don’t know or care about lockers, and toyota knows it.
Mercedes probably only does it because from a production standpoint it’s simpler (and possibly even cheaper) to stuff the same axles under the high-spec versions all over the world, and a g wagon buyer won’t notice the cost increase. Keep in mind a 21 G is 40k more than a 21 LX. Yes the 600 will probably go up in price but it simply can’t be by that much.