Why does the PTB exist?

I thought it was to see how the killer does in game if he needs to be buffed/nurfed or if there are any bugs coming with it. But why do they give out an updatd that makes nemesis unplayable? It lags all the time you pull out your tentacle. I hope they won't take ages to fix this like every other bug. It's kinda sad the only team in dbd doing a pretty good job so far is the design team

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