They trimmed out engineering's SM energy because one too many bald asf MTs blew it up and medical was trimmed because people hate going to medical after every fight.
They trim it not for combat but because the community hates anything which makes marines side more annoying or harder. If they were doing it for TDM medical wouldn't had been trimmed and maybe made even harsher because harsher medical allows for attrition based combat meaning alien's don't have to be as strong to beat the deathball, yaa asymmetrical combat, they do it becuase it actually does suck ass going back to medbay for a broken foot.