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Some form of BL will always be needed
Just today I found a perfect example where BL is literally needed to down a survivor as a mini-infinite was created due to bad spawning rules.
I was playing as huntress on father Chambells chapel and due to bad RNG a tree spawned very close to medium size rubble block which created a mini infinite. The tree was close enough to the rubble to block (fat shame) killer from passing between but allowed survivor to go trough.
This made it impossible to catch up with base 110% speed to the survivor and rubble was far too high to throw a hatchet over it. For the sake of testing I attempted to catch up with the survivor doing as perfect loops around the rubble as possible but it just wasn't doable. The survivor was 100% safe and no matter what he couldn't be caught in that spot.
Luckily gens got done and said survivor was forced to leave his safe spot or die to endgame collapse. Yes I know, this is extremely rare and happens in like 1 out of 100 games but considering how DBD is without BL there always will be ways to somehow exploit the game to create mini infinites.
I personally don't like BL and wouldn't miss it if it got removed but at the same time I don't like when games screws up and creates whatever kind of infinites due to randomness of spawning rules or some other issues with the game that allow creation of safe spots.