I still think Windows app compat for Linux (i.e. as Wine does and Valve productized with a gaming focus) is the better solution since it offers a true upgrade path out.
I realize ReactOS has a potentially wider useful scope (I think device driver compat is part of what they're attempting to do, so it'd offer a solution to keeping niche HW running) but I think it's just a smaller audience.
>it'd offer a solution to keeping niche HW running
Preservation. It ensures WinNT survives as a platform even if Microsoft abandons it, which some would argue the present state of Win11 counts as doing.
Has anyone thought about making the linux kernel roughly compatible with NT? Like how FreeBSD is compatible with Linux? I know it'd definitely be harder as NT is proprietary but syscalls (in my very uninformed opinion) seem all that difficult to implement, even without a userland