Still is.
Just ask Steve Barkto.
Heck, Geoworks supplied free by AOL was in the early days left early versions of Windows in the dust. A fully set of apps running over DR-DOS on my 640k Toshiba 3100e and a half card modem made me a road warrior. Well written and tight code that ran fast on the 286 cpu. The WYSIWYG word processor was unsurpassed in ease of use and features. IMO still my favorite WP. After AOL dropped it for Netscape, IIRC, it withered away. Still, I ran GeoWorks Pro for quite a while on my 386 machines.
“OS/2 was superior to Windows in every way. “
Not even close. It was a disaster of an OS. Who in their right mind released a single threaded kernel??