I liked OS/2 in the 1990s and was given Warp 4 by an IBM sales engineer ; IBM should have pushed it.
There was also GEOS from Berkeley.
Marketing determined the winner not best products.
Which is a common thing .
I remember the first time I installed OS/2 and couldn’t believe the number of 3.5” disks you had to keep swapping out. It was a great OS.