“... OS/2 was a much more stable, secure and reliable PC operating system than Windows....”
What wasn’t?
Gates was as much a computer guru as Obama is a constitutional guru.
And both are equally matched crooks.
That's a misrepresentation of the quality of Gates' work (Windows is it was then). OS/2 was more reliable not because the folks in Boca Raton were better software people than the folks in Redmond.
It was better because it was designed at its inner core to run only on '286 and later processors that had the new "protected mode" that gave the OS the chance to manage virtual memory by process, and also had a robust memory management unit to catch (or "trap") exceptions when something wrote or read from memory that was unallowed.
Windows didn't even try to worry about that until Win 95, though the 3.1 release of windows did start to roll some of that stuff in there with their VXD (virtual device driver) architecture. Furthermore, Windows had to stay 100% DOS compatible, which shot any idea of using a lot of the 286 and 386 protection features.
Gates actually did early development work on good products. The operating system for the famed TRS-80 Model 100 (a laptop still used to this day) was the last software he personally contributed to.