No joke, I've wanted that for so long. I never even played the originals, but I think an industrial mech-focused SoulsBorne from them could be incredible (maybe especially if it's a spiritual successor to Armored Core, so they can do what they want with the world).
What I think would set it apart is that the camera could be at the perspective it normally is, but the scale would be so much larger. So the level design could excel like it normally does, but feel totally different in presentation. You mix in some dark industrial super structures with paths weaving in and out and reaching to the sky like giant oil refinery/military base/mega city hybrids and make the post-downfall world building focus on climate destruction and military-industrial complex, you've got something very cool imo.
Maybe give the mechs jump packs for huge vertical leaps and dodges, and merge the typical melee focus with major ranged elements so you're doing a lot of shooting and rocket firing in between brutal metallic collisions.
Anyway, I'm backseat developing, but I like the idea of From doing a sci-fi take on their formula.