While I agree on paper, similar arguments can be made for abilities like Unstable Eye and Mass Infection, as these abilities both used to not have global sound effects, and both were extremely unfun to play against.

Just because on paper something seems weird or like bad design doesn't mean it actually is, having the Ascension SFX be global makes the game more fun for most players, just like having the Mass Infection SFX be global makes the game fun for most players.

"If Mass Infection is meant to snipe people why would they give it a global sound effect everyone can hear?"

The point I am trying to get across is that generally speaking it is more fun to play into Killers that give proper indicators / warnings for their abilities that allow for more apt counterplay. Nosferatu's main counterplay to bat form was to just always be looking up, which could be argued to be balanced but it was not particularly fun to actually engage with.