Why do some Aura perks tell you that your aura is being read while other don't?

I'm working on an experiment that I will post in a couple of days, but I have noticed that perks like Weave Attunement & Human greed show the survivor in the bottom corner that your aura is being seen, while BBQ & Lethal don't do the same.

I know that the first two perks are newer, so that can be the reason, but it also seems to give away that you are running the perks.

Also, as a mini follow-up question, why does it also do it for other perks, like for Thanatophobia? It'll show that it's active, but you can also see it work, but at the same time, Hex: Ruin doesn't show all the time that it's in play, other than the Hex symbol where the status effects are.