Why isn't more seen mid that often

I haven't seen a Morgana mid since mid s5. I actually had her as a backup mod at one point. I heard she's strong in general. She counters lux and all the other mids I play hate hate hate lux. I play talon, brand, and Veigar. She's not a bad controll mage. You can zone them off of cs. You also have decent cc for your team. Get a 5 man ult if they rin the same way and gg. Welp rip since they were stupid. Just don't 1st pick because meele assassins. You will lose. I say meele specificaly because Leblanc is a ranged mage assassin and she counters her. Arhi, not so much. The shield can block a pesky nuke. She can use bad positioning to her advantage and in lo elo, it happens alot. While it's true she is a good supp, she is still a good mid. Why isn't she seen mid.