I would probably ban it too, honestly. Then again, I'm a DM who likes to see teams who aren't min maxed to hell and back. I'm currently playing one and forced to play one after that campaign because the rules lawyer player has made the game so unplayable for anyone who does because the DM scales to that player and not the rest of the party.
I'm not even joking. Our party fought a dracolich at level 9 with 5 party members. And it was dead in 4 turns. How? The party has an eldritch godling who can channel positive and negative energy better than a cleric can and managed to nuke the dracolich after three turns of charging to almost half his HP.
On turn 2, I did 256 fire damage being a kineticist and scoring a double crit. On my fourth turn, I did 64 damage and dropped the enemy since it takes me two turns to charge up and unload a blast at the enemy and NOT kill myself in the process. It's not fun anymore because I literally would walk into a room and an enemy would appear and I would insta kill it by doing 115 damage to it before it gets a chance to react. I ended up torching illusions of a guy's dad, the rule's lawyers character's mom, some guy's mentor, a guy who made magical nukes, and this guy who I killed when I got possessed by putting a gun to his head and firing.
And then comes the rules lawayer's one-off game where he DMs the final part of his character's storyline where we fight his brothers. Everything is legitimately made as a possible PC, and what happens? We're fighting two level 20 summoners, one of which has an eidolon that's essentially a kraken, and the other spams little dudes and redirects my fire at my flammable allies. All 115 damage from a maximized and empowered hit without critical strikes. It's not fun because it's me, the rules lawyer and the enemy dropping damage in the 100's, and everyone he made has an AC of 30+, and his eldritch godling has a charisma score of 47 AND CAN INSTA KILL EVERYONE WITH A NEGATIVE ENERGY BLAST. And he doesn't care he's already accidentally killed a player. The only reason I'm able to do anything is because my ungodly amount of damage attacks target touch AC. And somehow, it seems I'm the only one who can do that, since the godling is sitting around charging her energy for 10 rounds to do something and not trying to heal anything (this is his cohort, so she's level 9 or something), the guys actual character is dead because I blasted his face off when my blast redirected at him, and no one else can possibly do anything except the gunslinger who's got two revolvers that are only good because he's supposed to be the GM's (the REAL GM) character who helps us in combat.
I said it before and I'll say it again: I hate min-maxed characters and this is why...