@stefan
Speaking for myself: For me, filters have always been filters, and they served to hide posts.
I never associated them with content warnings.
At this point, I have some further ideas: I am thinking of the discussion that Mastodon "misuses" the title field for content warnings (according to the accusation). If you move the content warnings to the filters (for this, you could define a few standard terms to write in the text, e.g., "/rude, nsfw"), the title field could be used again as it is in other projects. This could perhaps be implemented across projects.