Cost vs Benefits of Wikiprojects
Dear Jorge Solfi,
This is indeed a concern. Tagging articles with what you call features is part of what I call "maintenance edits". I agree that such edits may have negative indirect effects on community health/happiness. I can recommend you to read this essay by Sjc. On the discussion page, I made a comment about "maintenance-driven policy" and my fear that this discourages good editors. The problem we discuss here is slightly different, but similar.
I do agree that creation of new "features" is too easy in the current set-up. In my view however, maintenance edits aren't a primary task of wikiprojects.