Why is Maokai specifically locked out of using Overheal?

It seems like he's one of the only champions who would actually be able to make use of it without an enchanter around, given the fact he's one of only around three champions who meet the viable conditions of having a heal and building enough HP for the 10% cap on Overheal to be a decent shield. And just to note, Overheal does not consider regen so other tanky self-healers are out.

But Maokai's passive doesn't heal him if he's above 95% HP. I'm trying to think of a reason why that might be necessary, and the only thing I can come up with is that his sapling damage was too high. Was. After he was adjusted and since tank items were nerfed at the same time as his update, he's too weak for that to be a reason.

It's more likely they just don't want to see Maokai, despite the fact the new Maokai isn't the Maokai that dominated pro and high rank play.

This needs to be changed, since he is the champion with the most synergy with that rune, but is locked out of using it. It's not like you're going to be going full AP Gunblade or building lifesteal on him.