User blog comment:MisterWoodhouse/The first migrations to the Unified Community Platform/@comment-3002952-20201028114857/@comment-26902561-20201030200230

As someone replied to me when I asked about Category Exhibition:

"Short version: Google rates your site by looking at the total number of pages and then at the number of pages that are 80% similar, and punishes sites if they stuff their page count with "nonsense". The problem is that every tab of Category Exhibition is counted as a duplicate of the first. The same goes for Classic Categories, but as those have 200 instead of 16 per page, pagination is less of a pressing issue. Dynamic Categories was built to counteract this."

So it sadly doesn't look like it will return. But then again, you never know...