Agreed. But, as I pointed out before, part of THAT issue is one of limited options.
This is Fantasy, people want to see heavy armor, we like heavily armored figures. Out of the Twelve standard classes... there are only three that would traditionally wear heavy armor. Fighter, Cleric, Paladin. You will not see art of heavily armored characters who are: Barbarians, Bards, Druids, Monks, Rangers, Rogues, Wizards, Warlocks or Sorcerers.
So, if you want heavily armored art, you are going to end up with art of heavily armored religious characters. They are 2/3rds of the possible characters who can HAVE that much armor. So I doubt it will be replaced. I would like to see it supplemented though. After all, we do see plenty of clerics in robes. And, actually, 5e hasn't been the worst at this yet.
Out of the Five Official arts I am aware of, two are non-standard (Glory and Redemption) two are fairly standard (Torm and the Watchers) and the last is a Conquest/Dark Paladin. That is a decent mix.
Also, I had never noticed before that the Conquest paladin is wearing a belt of broken swords. That is kind of bad-ass.
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