Shove is the most op ability in the game currently.
I disagree.
Back on topic: If the action economy of shoving remains as it is, Shield Master really needs an additional feature to make it worth taking. Maybe an improved shove that knocks prone regardless of height? Another boon to defence? Captain America throw?
Personally, I took the 5e version on my Paladin and the feat felt lacking. It didn't help complete the "guardian" vision I was going for. I wouldn't mind if Larian took a few liberties with it to really make it shine.
