They are catering ultimates to casuals like they did with Elden Ring.

[KuroTenshi]

Massive part of what makes Ultimate's difficulty is having to start over and over from the very beginning, it has always been incredibly tedious and the addition of a checkpoint is going to raise eyebrows.

Personally I don't have any strong feelings about it. I would totally welcome longer, harder fights, somewhere between Ultimate and Savage, with checkpoints, but I feel like it has the potential to take away from what makes Ultimate, Ultimate.

Eh, IMO make it about skill not attrition if you want something difficult. Using duration is pretty much the prime example of 'fake difficulty'. And admittedly somewhat disrespectful of people's time.