I know those things because I frequently have >200 tabs open, and have done so for many years. But I'm not surprised that it would be considered too niche to fix, because the reactions of most people (among a fairly tech-savvy sample of people looking at my web browser) go to the point of making comments about their surprise at how many tabs are open on my screen. It just isn't very common behaviour.
During the 'graphical glitch' era, I was an intern on the WebKit team at Google and asked about the bug, and some people knowingly chuckled and said, "yeah, that isn't something that's going to be fixed soon." I imagine it was also a tough bug.
Anyway, it would still be cool to support better tab features.