My character really likes chain shirts. He much prefers them to other armor, such as a breastplate.
I thought maybe I could make up for his tastes with a piece of magical armor, since usually magic items are considered stronger than mundane ones. But I'm realising that it's still not quite as good. There are two benefits to mundane armor that I can find, and no such relative benefits to magic armor (besides the AC bonus):
Magic items can be suppressed by the antimagic field spell, and there seems to be no way to make non-magical armor not work that wouldn't also work on magic armor. With mundane weapons some creatures will be able to resist, so magic on weapons is great. Not so with magical armor, as far as I know.
A Forge Cleric can use their Blessing of the Forge ability on nonmagical armor, but can't use it on magical armor:
At 1st level, you gain the ability to imbue magic into a weapon or armor. At the end of a long rest, you can touch one nonmagical object that is a suit of armor or a simple or martial weapon. Until the end of your next long rest or until you die, the object becomes a magic item, granting a +1 bonus to AC if it’s armor or a +1 bonus to attack and damage rolls if it’s a weapon.
Is there anything a +1 chain shirt has that a mundane breastplate doesn't have?