OS/2 had many flaws but its multitasking was unseen on a PC at the time. I remember formatting a floppy while running two 16-bit Windows sessions (which were communicating with each other) and multiple DOS windows, thinking I was in the future. Even Windows 95 was limited by many system calls being funneled through single threaded BIOS or DOS 16-bit land.
I remember installing it from the 15 billion floppies it came on and thinking much the same thing. It seems like it was on 5-1/4" disks. Can that be right? And REXX! Ha. REXX.
The IBM PS/2 only came with the smaller disk, so bigger wasn't necessary