Why is the user Normal Human always annoys every body with tags? He is moreover not moderator or webmaster, so why has he the rights to always mention to every body that tags or some other stuff are not right? It's really really annoying! And often, the tags mentioned are much enough! If you ask a question about Galois theory, what other tag than galois-theory can be used? No one! Or if you ask a question about splitting field, which other tags can be consider? It's the only one! So why adding an other tag? That's why I write a message here, to have answer about the rights of Normal Human, and to know if it disturbs also other people.
Why is the user Normal Human always annoys every body with tags ?
Not everybody, mainly just those that do not use them efficiently. They have automated this, which is why they are so prolific at it see Suggestions of tags and title edits by user NormalHuman - How to do it?.
He is moreover not moderator or webmaster, so why has he the rights to always mention to every body that tags or some other stuff are not right ?
It is correct they are neither webmaster nor moderator. But given that it is the case that every user with 2000+ points can change the tags of a question, it can hardly be considered as stepping beyond ones privileges when a user points out the tags could be changed.
If you ask a question about Galois theory, what other tag than Galois-theory can be used ?
Or if you ask a question about splitting field, which other tags can be consider ?
See above, and galois-theory.
So why adding an other tag ?
Various users filter by tag and only look at questions tagged with some specific tags. Mainly, they will chose rather large tags for this filtering. When you just use splitting-field with its around 150 questions many users just might not see your question. With galois-theory this is slightly different, as it is rather large itself, but the reasoning still applies.
Thus it is really doing yourself a favor to add more tags, usually. But if you really do not want to just ignore the comment. Usually they will delete it soon enough.
Some data for context. I looked up every comment of the "broader subject area" type made over the last 24 hours. There were 20 of those. Here is how the first revision was tagged (links go to that revision):
- transcendental-numbers, independence -- although tag wiki of independence tag says this isn't what it's for.
- spherical-geometry -- that one I added to "okay" tags
- orthogonality, bessel-functions -- the latter should be used along with special-functions, see meta discussion.
- ramsey-theory -- no combinatorics tag, no reaction to the post.
- correlation, covariance
- learning ... we still have that tag, apparently it's somehow different from education and self-learning
- curves ... no, it wasn't about geometry
- splitting-field again, by the same author. After this I added the tag to "okay" list not because I think it stands well on its own, but just to get this incident over with.
Having galois-theory as a sole tag would not generate a comment, so mentioning it a red herring.