again, "setup" time and "pack up" time for infantry in building. its more realistic instead of instant teleporting 6 guys out of a church and it makes occuping buildings more dangerous (high risk/high reward) due nades becoming more lethal and general flamers/arty because you cant just hop out/hop in.
plus point would be the dimishing of these building hoppers, its so annyoing and there is no counterplay to it.
Best idea. And increase pack up time of HMGs in building.