Always an interesting project and some great achievements, but it’s hard to see it being more useful than Linux + Wine (or now Proton)
Does anyone use ReactOS in a production-like fashion?
Not yet but it seems like they've finally started working towards that. Driver compatibility has improved dramatically over the last few years, for one.
Last i tried it a couple years ago, it was basically impossible to install natively. (On basic intel haswell system)
Drivers exclusive for Windows.
You know your old Soundblaster AWE64 Gold, with all bundled programs [0]. Or that very special Analog Video grabber card you have.
Wine is user space. This is the full OS.
[0] Ok, that maybe works in linux, but you get your point.