Every xeno would be forced to be on one end of the evo tree, every marine would be forced to use the same attachments, the same gun, same armor, same spec kits (?)
some exclusions would obviously be required, the queen, maybe 1-2 builders, maybe the marines could still keep the specialists and smartgunners or have it changed based on observed balance
maybe it wouldn’t be possible but i think it would be hilarious making all the marines use heavy armor and shotguns vs spitters