Hitboxes are, for the most part, fine.

You're probably talking about bad latency and killer sided hit registration. If the killer has a bad ping, your (the survivor) position wont be as accurate and therefor grant the killer a hit that should not have connected. Devs already tried to implement a hit registration system, so that it looks and feels fair for both sides but it just didnt work out.

I guess they're currently working on it and hope that its still going to be released this year along with the new early game mechanic.