I have added tag-excerpt and tag-wiki which at least mention that it is useful to add also other tags. (Many people ignore tag-excerpts, but at least some users might notice it.) — Martin Sleziak 14 hours ago

I take from this action that you think this tag is worth keeping? — Asaf Karagila 14 hours ago

No, it was not meant as a support for keeping tag. (I am neither clearly against nor clearly for the tag. I can see that it might be useful - if pressed to make some decision I would lean towards keeping.) I think that even if the tag is later removed and the information in the tag-excerpt only helps user during the (possibly short) period while this tag exists, it is still useful that it is included there. — Martin Sleziak 13 hours ago

Perhaps in connection with (borel-sets) tag, it might be worth mentioning that (sigma-algebra) was made synonym of measure-theory a few years ago. See also here. — Martin Sleziak 45 secs ago