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8:13 AM
It seems that the number of questions with deprecated tags is more-or-less steady. You can find here stats from August 25, June 2, May 1 this year.
There were 1000 questions with deprecated tags in August 2017. Now there are 882 questions with deprecated tags.
Here is breakdown by tags:
has 325 questions, 180 after removing most common algebra-related tags, 101 with no top-level tag.
has 171 questions, 84 after removing co.combinatorics and 45 with no top-level tag at all.
has 397 questions, 246 without the most frequent geometry-related tags and 147 with no top-level tag at all.
There are also some roomba-eligible questions in the above counts, but the previous counts included those as well.
Here are the links used to find the above numbers: chat.stackexchange.com/transcript/10243/2018/10/27
As usually, I'll remind that it would be relatively easy to prevent these tags from being added to new questions: The existing deprecated tags should be blacklisted. (Like, to add a recent example, YCor in the question Vertex Connectivity of the Hypercube mathoverflow.net/posts/316086/revisions .)
There is 98046 questions in total, 76289 questions which have at least one top-level tag, 81044 questions if we count also (linear-algebra), (graph-theory) and (set-theory).
So 22.19% of questions have no top-level tag, and it is 17.34% of questions if we take the less-strict interpretation.
 
 
6 hours later…
1:48 PM
The question English translation of Serre's paper Gèbres has been recently bumped by adding the tag. I have added . The question is still missing a top-level tag - in case somebody knows this area perhaps they can choose one.
4
Q: English translation of Serre's paper Gèbres

Leandro VendraminDoes anyone know if it is possible to find an English translation of Serre's paper Gèbres? Here is the complete reference: Serre, Jean-Pierre. Gèbres. (French) [Gebras] Enseign. Math. (2) 39 (1993), no. 1-2, 33--85. MR1225256 (94h:16074)

 
2:00 PM
And there seems to be a bit more editing on the above question: mathoverflow.net/posts/84803/revisions
@PraphullaKoushik "gèbres" has nothing to do with "gerbes". I've therefore removed the tag you just added. — YCor 50 secs ago
 
2:11 PM
@YCor I thought it is french name for gerbes :D apologies. — Praphulla Koushik 1 min ago
@PraphullaKoushik "gerbes" is a French word, literally used in mathematical English. "gèbres" is a truncation of "algèbres", which is the French translation of "algebra", so would be "gebra" in English by obvious analogy. — YCor 23 secs ago
 
 
4 hours later…
5:56 PM
I wondered what happens with the taxonomist badge for discrete-mathematics and abstract-algebra if the tags get removed. But I see that it can happen that this badge is displayed with "No longer available' instead of the tag name.
 

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