I left in about '97 or '98... too much noise traffic, too many people being way too "TNE is the ONLY way", and too many people going "There's Nothing Wrong With T4" despite the TML surveys showing that the majority felt the task system was broken. WJP and I were at opposite ends of the spectrum on HOW to fix the T4 system, but both were extensively flamed for even proposing solutions, often by people who fessed up to not having tried to run T4...
And, of course, Hans, Myself, Thrash, and a couple others having basically the same "hot-button" debates, back in the day, as we have here. I truly do respect these guys, even if I think they're wrong...
The XBML had some of the best MT designs I've seen. The division there was not a problem; it really kept most of us MT fans from polluting the TML of the day; setting issues on the TML usually got cross posted, while tech didn't. As far as I'm concerned, the beginning of the end was when the XBML was told to join the TML or Go Away.