People really don't use Admin enough, especially in Skeld. There are times where you can tell someone has vented because they have to go a specific route to get to diff rooms. For instance, in Skeld, a user can't go from Electrical to Security or Medbay without venting, so you can use it to narrow down the imposter during meetings. I tend to camp on admin when everyone hogs Security in Skeld, since the two together can be really powerful. There are other "impossible routes" but the Electrical-Medbay-Security thing is long and far the biggest.
This is also really helpful for Imposter, as you can deduce the rough routes everyone is going. The fewer numbers, the better. In Skeld, you have a vent right by you, which can give much quicker access to these areas. It's kinda what the thing is designed for, but many players just ignore it and it irritates the crap outta me.
Generally, though, a lot of Among Us players don't utilize the resources the game gives them enough.