To me this sounds like an all-around improvement, with an eye on catering to the e-bikers given that's probably where they have seen the most growth plus being outside the original design intent. I have a Storia V3 on my Levo SL. It's a fantastic shock. It's a tad bit over-damped for my preference and terrain, but that makes it feel "sporty" rather than ultra plush. The faster I push it, the better it performs. To put it another way, It's never been magic carpet, but the bike never feels under-gunned in rocky, rutted out terrain.
Given the higher leverage ratios some bikes are pushing plus the heavier overall bike+rider weight which I bet is a trend with e-bikes, the increase in max spring rate, the wider damping range, and adjustable HBO all seem like plusses IMO. All of which could benefit MTB as well. Marketing jargon aside - "increase sensitivity", "negative spring", "reduced friction" all seem to be improvements to the suppleness as well. Like making a 9/10 shock a 10/10 shock.
Overall, EXT makes killer shocks if you have the $ and willness to upgrade. This just seems like an improvement all around regardless of bike type.