Problem: I'm working on articles about gastropods (= snails), We already have more than 30,000 articles in the Wikipedia:WikiProject Gastropods. There is already a bot for new articles (en:User:AlexNewArtBot/GastropodsSearchResult), but not for changes made in existing articles. This makes it quasi impossible to track those changes and remove any possible vandalism. And this goes for all other WikiProjects.
This would benefit all users.
Proposed solution: creation of a bot for each WikiProject, tracking changes in each WikiProject. Articles in each WikiProject are easy to identify since they have a dedicated template on their talk page.