Well, editing wars (and just bad behaving) are a real thing in the wiki-world. Wikis are a bit a rare case still nowadays in (Discourse-)forums, but that situation is changing — earlier it was close to impossible option to choose and use.
But we don’t give totally free hands to majority to edit first posts, and no matter how we want call a topic that situation doesn’t change. Or of course it changes because of nature of wikis, but the trust issue doesn’t change.
Because TL4 is a choise of admin, not giving just automatically based on given likes (sure, there is a couple other metrics as we all know 
) there is no reason limit TL4 rights. But TL3s and lower are different situation.
Perhaps we need possibility to force approving. There is just one minor issue in such forum-wide limitation: all wiki-topics aren’t so heat. Majority of topics are not and when a forum suffers widers such acting there is deeper issues. But forum-wide limitations increase workload of moderators and with topics, where is no overcooking, no one want to see unnecessary work. Plus limitations limit will of users to write — that is wanted situation every now and then, though.
But what we need in pre-ideal world is an option to force approving per topics, and even with a timer.