I would like to request that elements that even if the content tags are on users blacklist, they should be excluded from beeing blocked for this user in the case if they are marked by this user as favorite

You should have a look at this topic #25872. In case you are on pc, consider installing it. It has lots of useful features. E.g. Excluding favs from the blacklist, and enabling wildcards topic #33407 + about 50 other good features