Maybe now that the new search feature is rolled out, site developers might have time for other projects.
My concern is, that a fully implemented multiple tag exclusion as seen on Steam (if you look for it) is not a trivial task to implement in the existing framework.
Personally, I have little use for the feature. I am an adult and can surf without ad blocker. If I can scroll past ads I do not care for, I can scroll past games I do not care for. The typical offenders, horror and visual novels, are also typically recogniseable at a glance. There is just too much inconsistency and disagreement about tag usage to rely on any filtering.