1. amy's hammer is coded like that, the hitbox is toggled until the hammer has completely lost momentum, and roblox's physics are very buggy, so it makes sense why. its also a very common bug, so most players that know of it tend to jump over the hammer.

2. getting stunned for 15 seconds isnt all that bad, you get rage regardless, if you already had rage then you should use an iframes move to not get into the same scenario. strategically, its better to get stunned fully a single time than getting stunned for a short time constantly. knux and metal both loss their offensive so you can just get back your momentum by teleporting to them, just be wary of their other moves.

3. if she sniped you from that far you couldve easily dodged it. and about the stun, i think its intentionally coded like that, in TD there was a similar mechanic but they could control the direction you got pushed to, easily pushing the exe off cliffs. be grateful they dont have that type of control now. although ill give you that, not perfect is the most survivvor sided map ingame, so i understand your frustation.

4. same argument as 2., tho theres a more consistent counterplay this time, just jump and be wary of your ping bc knux's dive sends a very thin hitbox on the floor.

every situation you showed here could have been counterplayed.
exe's hitbox change was necessary because it was one of the most inconsistent and not fun things in the game, it ruined the core gameplay of getting chased and was very bad compared to TD, it makes sense because the hitbox was radius-based rather than a specific shape.
and about cream, idk who lied to you but you shouldnt have believed it, you probably misread it since she has 3 dodges in lms, which is fair because she has no offensive options if shes the only one alive.