The interest in the R1T is you don’t need another trim to be configured for on-street luxury. As delivered you can put it in sport mode and get 0-60 in 3 seconds, dampening for cornering, etc. All the reviews I’ve read (edmunds, motor trend, etc.) say it is the best on-road truck (and better than a lot of cars) they’ve ever driven. Then switch it into off-road mode to get higher lift, tune the pedal response, set the individual drive tires to manage tire slip at slow speed, etc. The value proposition is you’re covered for all uses in one truck.Only one of the vehicles you listed has the off-road capabilities of an R1T and the R1T beat the Hummer EV to market - and for a lot less $.
From the article linked by @RivianXpress
That said, I’m sure there are luxury BEV shoppers who have no intention of ever off roading and if that’s the case, I guess I don’t fully understand the Rivian interest. Bringing the comparison back to Jeep, there are Cherokee and Grand Cherokee models with off-road DNA but configured to the on-street luxury SUV market (e.g. Overland, Altitude, SRT, and Trackhawk trims), but I don’t think Rivian has such options yet.