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Breakable walls change their position
Breakable walls are a good concept but the way they are placed is not good, as the vast majority of breakable walls are placed next to a window which means most killlers will need to break it.
To fix this, place breakable walls in places where the killer has to decide whether to break them or not.
Take the game map as an example, there are many breakable walls blocking the way, here the killer decides whether to break them or not, if the killer breaks them the killer will be able to cross the map faster and patrol around the generators faster however this will open a new escape route for the survivors and also make it easier for them to move.
If the killer decides not to break the breakable walls this will reduce the escape routes for the survivors and make the chase easier, however it will make the killer take longer to cross the map and make patrolling around the generators difficult.
I don't mind some breakable walls next to the windows however I don't like that this concept is used in most maps just to make the windows stronger as if that's the only use for breakable walls.
The idea is not a failure but the breakable walls are placed the wrong way.