i absolutely guarantee you if you asked most casual players what's the biggest barrier to entry within competitive tf2, there answer would be either "I can't play my main class full time" or "I don't want to play 5cp all the time" (ignore viaduct), not that their specific unlock is banned. Pushing for a more open whitelist at the expense of competitive players enjoyment of the game doesn't make any sense because in the end you'll still end up banning shit that is absolutely game-breaking but theoretically may make more classes viable full time like the disciplinary action or wrangler, and this class/map barrier to entry will still exist for newcomers. (note: I am in no way advocating we unban shit that's blatantly broken)
also i challenge u to find a casual scout main who's actually like "oh wow bonk is unbanned now in competitive now i'm going to try it because that one weapon ban was the only thing that was holding me back !!"