I think everyone can agree that the best part of Hotline Miami is the roof (or maybe the car), and for good reason-- It's fun to play around with the diving board and try to get on the higher area. However, this makes you extremely vulnerable to C4s. Besides the roof, the map is kinda shitty... It's just the same floor copy/pasted like 5 times + a small street area. The map inherently creates unexciting gameplay with its cramped corridors and small rooms. If anything is making gameplay stagnant, it's the map itself.
Think about this: What could the traitors do to win on this map if C4s are disabled? A large majority of the players group up on the roof, so traitors would either have to charge them together or just die one by one. The innocents would have too great of an advantage.
In all, the map is kinda doo doo, and removing C4s would add to the already undynamic gameplay, -1.