keep it if you’ve got the space
it won’t fuck it up really as long as you clean it regularly
i also have the same problem, apart from really we don’t have room for 6 bikes. if i get the ultra 700 af i’ll have to get rid of either the triban 3 or my single speed. i really like the single speed for commuting as maintaining it is so easy and i don’t care about locking it up outside all day, but i want to keep the triban for winter rides / possible racing / if i ever get zwift. what to do, eh? new flat does have a shed but it is slightly falling down and wouldn’t be surprised if anything i left in there got nicked.