for the first one
that would make it really unfair cuz basically every single killers sprinting speed is faster than survivors sprinting speed allowing killers to kill people WAY too easily with JUST m1's
for the 2nd one
killers have different stamina gain and drain specifically to balance out the +10 stamina advantage, if they had equal stamina it would be way too hard for the killers to catch up
you're basically suggesting "make the game killer-sided or make the game survivor-sided"