User blog comment:MisterWoodhouse/Social Activity, the 2010 Editor, and Unpausing Migrations/@comment-24937036-20201014135240/@comment-26939652-20201014192408

And what they saw "as useless" and the community thought as vital is the first disparity that caused the pause. That already showed that they didn't make a good inventory of used and important features. In the best case, they misjudged it.

Thing is, they continue to do so. The 2017 editor remains the default for new users, which is full of usability anti-patterns. The 2010 editor is not up to par. Accessibility is done in "phase X", after the dust has settled - which is not a good message for people that rely on it. People who relied on these category views, are left in the dust and no alternative is provided on short notice. Phase 2 may be too late to fix the loss in user engagement for these. I mean, if you look at the difference of the picture above, you can see why someone would not feel compelled to click links whereas the old version is inviting.