The tags "ne" and "ci" were created with this question: The use of ci when specifying locations. At first, I thought that it was unnecessary to keep such specific tags, but some people have expressed the opposite belief in a comment to that question. I would like to know what do you think about that.
I understand that ne and ci may be troublesome for learners of Italian, but having a tag for every single troublesome word (irregular verbs, ambiguous nouns, prepositions with or without articles and so on) would lead to thousands of them, and then they wouldn't be more useful than just searching for that word in the existing corpus of questions and answers.
I am strongly in favour of higher level tags: if one has a doubt about a difficult pronoun/particle, they may just look for “pronouns” or “particle” (if we deem this a suitable tag).
Here are some thoughts on why ci and ne should be tags:
Commonly, ci and ne are taught as specific topics in Italian textbooks.
They are problematic for people learning Italian as their usage is complex. Italian learners may want to browse all discussions for mention of these words.
Though they are used either as adverbs or pronouns, they technically fall into their own category of small, invariable words with little to no meaning known as particles. (Perhaps particles should be its own category as well.)