my psion 3a was better than win3.x :-)
i could have spreadsheet, database, agenda and word processor open and swapping between docs instantly while my win3.x desktop lurched and trashed disk with just 1-2 windows open. also win3.x at the best of times was pretty crashy. a few reboots a day was quite common.
plus memory. some programs wanted expanded, some wanted extended so you ended up with multiple boot configurations, some for games, some for windows, some for dos apps.
In fact, Psion did release a SIBO "emulator"* for DOS which seems to be basically a PC port. It's intended for developers, and hews to replicating the mobile devices rather than taking advantage of the PC hardware, but you can imagine polishing it a step further.
* https://home.hccnet.nl/joop.nijenhuis/psion/emul_0e.htm