I think you're mis-remembering a little. Or maybe you had a different job than I did.
Back then, the web WAS IE6. There was nothing else. And it really was, for a time, a popularly-praised relief from the previous browser wars. I didn't have a standard but then again, at least I had a standard. You can design for IE6 and be sure it would "just work" everywhere because IE6 was the only option. Market share in the mid 90's IIRC.
The real crime is, as you went on to explain, the utter stagnation. And of course insult was added to injury when Firefox was released. For years then we DID legitimately have the trouble of designing for one modern browser and one curmudgeon who just happened to still have 4/5th's of the market. Lame.
The fact that that bending resulted in IE6 still being able to mostly display websites today is not any sort of testament to IE6's quality as a browser.
Not relevant, the problem is that IE6 didn't work with the web back then unless untold amounts of time was wasted and untold amounts of pain experienced to get it to work. When Microsoft got the market leadership they just stopped every investment in it until forced to get back in the game, and GP fears the same will happen again if they're allowed to gain dominant position again.