Ruin Nerf is a Horrible Idea.
In its current state, it is almost needed on many killers because of how horrific map design is for killers. If 80% of your killer players use the perk, shouldn't it signify an underlying issue to the mechanics of the game?
What's a killer like Huntress going to do on Red Forest now?
This change would be entirely fine if maps weren't designed so poorly, and made survivor-killer chases rely on skill; not how many safe pallets you can chain back to back to back. If the pallets and windows were more skill based, many chases would end faster for a lot of killers, and gen speed wouldn't be so much of an issue. But when you're able to run through pallet after pallet mindlessly, the gens become a huge issue. Considering the state of maps right now, this is a horrible change.
It's also not like the perk had lack of counter play, literally all you had to do was find a totem to cancel it out entirely.