>>717311453
>MT framework engine
That has nothing to do with it. Emulated games are far easier to add rollback to since save state and load state are native features. There's a reason games like GBVS and UNI just made new games instead of retrofitting rollback since the costs and manhours would be comparable but you'd sell more from a title update. It was far easier to retrofit ASW games after the first one since they were built on a common skeleton and as for +R, XX itself is from 2002 so the added computation costs are negligible for any potato in 2020 even if you implement it naively.