The f95 tagging system was a huge debate a year ago or something. I don't think these sorts of things were satisfactorily resolved. Like I could see a system where you could weight a tag by your perceived prominence in the game. So you could search for games that were > 50% hypno or something.
Issue is that the uploaders only upload and throw some rnaomd tags they probably got from dlsite, not play the game, so it`s on the community to tag the game using the reporting system. Having weighted tags would be pretty much impossible.
That said we also have the alternative like dlsite, we`re some games a barely tagged at all. I don`t want to know how many games that have hypnosis aren`t tagged as such on dlsite.
Personally i just download the games on f95 together with a save, sift through the gallery and if i like what i see i keep the game, otherwise ignore > next game.
It takes time, but what
fetish hobby doesn`t?