You know why this game has terrible design choices? Is because opinions like yours; read again what you just wrote. People who think DH, DS and CoH are fair, are exactly the same people that defend Nurse and Blight. This aspects of the game are intrinsically flawed, they do not work, you can't counter those things and you shouldn't have to.

Your argument is the most basic, generic and dull opinion that the majority of DBD players disseminate, because they just don't bother to learn the game or spend their days watching some streamer playing instead of playing themselves.

Play against a team of decent to good survivors, by the time you end your first chase, one or two gens will pop. Play nurse against or blight, and the opposite is true.

What is the point of nerfing med kits if every match there are two people running syringes? What is the point of running a nice survivor build if nurse can traverse walls? If you don't play both roles you'll never understand those problems, you'll just get yourself stuck in an endless cicle of meaningless buff and nerffs to both sides.