That’s literally the point of a Paladin tho. Being brave, fighting enemies head on and inspiring others to great deeds.
Being a passive caster in the rear is entirely anti-ethical to the core idea of a Paladin. That’s what a Priest does.
Why train a Priest in martial arts to become a Paladin if they will keep being just a priest in plate armor?
Eh, I’m sure several heroes in multiple games, including Overwatch (see Moira and Zenyatta) would disagree with the “staying behind your team mates and heal” mentality.
Just to quote a pretty good reddit summary imo:
Holy Paladin is suffering a personality crisis and no one is winning, especially players.
For a long time Holy Paladin was a priest in plate, standing at the range camp hard casting heals. Then it got a rework to bring it more in line with the fantasy of a WarCraft Paladin, putting them in melee, building spenders by attacking foes and spending on instant cast abilities for heals. Instant casts was a decent trade off for having to build by attacking in melee, but it was a very unique playstyle, distinct from Priests. It was very effective in Shadowlands, where it was refined to probably its most effective iteration. HPal was also meta for a LONG time using this playstyle, and many prominent players and streamers helped to boost the popularity of the spec.
Near the end of Shadowlands and into DF, Blizzard reworked Holy Paladins to try and bring back the old caster playstyle, maybe because WoW Classic was becoming popular? We don’t really know why, but it sort of started a cascade of failures that resulted in the semi-large rework midway through Dragonflight.
Unfortunately that rework hasn’t panned out very well, the spec is now bloated, without a unique identity (as it had in Shadowlands), ineffective and, more importantly, not very fun.
Hopefully in War Within we get a rollback to the versions of Hpal we had in Shadowlands and get saved from this identity crisis we’re in now.