Chaosmancer
Legend
I have to disagree with the idea that 'will not wear' is just fluff. It is in the rule section. The rule doesn't say why they will not wear metal armour, but they won't and that's the rule. If the rule says that a creature won't do something then them doing that thing is breaking the rule. Now it is weird rule so in that sense I can see people wanting to houserule it, but still.
Also, are druids generally considered underpowered? My impression was that they're one of the more powerful classes already.
Moon Druids are, because Combat Wildshape is very powerful at low levels.
Other druids aren't, because they don't have combat wildshape.
They aren't underpowered by any means, I'd say they are similiar to clerics.... who can wear metal medium armor and use a shield with no rules saying that that is a problem.