My personal answer:
Just to fulfill what Ineos have boasted from the beginning: Making owners able to fix their vehicles themselves and give them all the necessary support to do that. In my view, it should be a personal decision of the owner what he prefers, being "pampered" by any warranty or taking (at least part of) the responsibility from the beginning.
And if I'm not totally wrong, the average Grenadier buyer will have larger technical knowledge and experience than , e.g., an average buyer of an asian ev or hybrid. The value of the knowledge of a community like this shouldn't be underestimated even by a most experienced dealer (which, in general, doesn't automatically make a most experienced workshop from what I have experienced...)
Again, just my opinion, no offence intended!