The fact is the majority of users on this site have dropped competitive Pokémon for the most part a long time ago. There aren’t many people who have Metagame knowledge for this current Gen.
Another thing is those users who play competitively and have a decent knowledge of their metagame (Me, you, Rising Manectric Senjoma-can’t remember the rest), and BananaBroSHSID (come back bro) can only play in so many Metas (or like so many metas). The more metas you play the less you start to know about each meta since you only have a limited amount of time.
Thirdly, the majority of unanswered questions are about Doubles, which nobody on this site besides you seems to play.
There are a couple ways we could approach this:
1. Get volunteers to learn about two or three Metas they would like to do. This could work to an extent, but could create places where only certain people can get points all the time. There is also is a chance people will fake being knowledgeable about a Meta. Like a noob at ZU could come and act like an expert. Since nobody here plays ZU, we can’t really correct any points that person makes.
2. Hope competitive players find this site somehow. :(