I kinda doubt it, the tag system is useless. I also think we need 2 tag categories, something along the lines of main themes, and incidental or something. The example I always use is, say someone is looking for a femdon game. If you go by the tag system you're going to happen on a TON of games, most of which are not femdom, and just include a scene which earns the tag. but if you had those 2 categories, you could search main themes and find what you are looking for instea of hundreds of games that only have a single scene.
I think it depends on the tag, though. For example,
multiple endings shouldn't ever be incidental: either there is more than one ending, or there is not. I ofc can see someone abusing that when a game has several game-over scenarios, but that would be on the mods for allowing something that realistically shouldn't apply. (If you die of wounds in a
Resident Evil game, obviously nobody considers that one of the game's endings.)
I think
story rich would be another tag that can't be incidental. Either the game focuses on story or it doesn't. There would need to be an arbitrarily assigned cut-off point, like a certain % of the game is story without other content or whatever. But I don't see wiggle room in a tag like this. That's why I think
Price of Power having something like that applied to it would set up proper expectations for the VN before someone starts playing it.
Off the top of my head, I can think of two primary scenarios where tags tend to become more problematic. The first is what you've pointed out: there's
a single occurrence of content and therefore the tag gets added. (Not literally, b/c obviously it could be 2 or 3 times or something.) That is where the categories you talk about would come in. Something like
femdom (focus) and
femdom (instance) would definitely clarify that. The second would be incorrect interpretation of tags, which is a whole other problem and discussion I won't get into here.
Despite all of the above, though, Pandaman has been very clear that the principle focus of this game is story, with romance and
some sex included. This is not a porn VN; this is a VN that happens to have some lewd content. Even if you take the sterility point itself, it's very easy to talk about that and show characters stepping out of tents after having had sex — all without showing any adult content. The plot of the story would be unaffected by an absence of lewd scenes. This just happens to have them because the dev decided to include them. All of this has been plain for the longest time; folks just need to learn to read the
Developer Notes on the OP and/or search the thread.