What's the single word for "too specific"?
Solution 1:
It kind of depends on the nature of the specificity.
For "specific" to mean, "of limited interest", you might consider esoteric.
For "insufficiently broad", then you might consider narrow (sense 2)
Solution 2:
hyperspecific (Wiktionary)
hyper- + specific
Adjective
hyperspecific (comparative more hyperspecific, superlative most hyperspecific)
1. Very highly specific.
What more do we need!