It's wild that this is apparently not even in the plans?
There are so many cases where you'd have to tag every single variation of a tag in order for people to actually be able to see it. Since Video Game, Video Games, Videogame, Video Games, Computer Game, Computer Games, etc are all the same thing but they'd all be completely separate searches with no overlap unless the post decided to include redundancies.
Is this something not easily achievable? The only sites I know of that do it are Itaku, and e621. It just feels as though this should be a core accessibility feature of any site that depends on tagging posts for it to function at all.