I’m willing to bet that even in casual holy is still better than prot. Idk much about Legion 2 but I do know that Holy was pretty much god before prepatch. Not only are they invincible, but they actually can dps.
My point is that the healer role makes tanks almost irrelevant in pvp. Healers are the god role in the game. There’s nothing that counters healers other than dampening. Not only are you powerful and are a force multiplier but kids worship you and will want to play with you because the game demands that healers need to exist or else pvp is unplayable.
These forums love healers and think they’re the hardest things to play in the game (lol). Going from a tank to healer is a no brainer to me. You’ll go from zero to hero by just switching specs on that Paladin of yours.