I think he got a point ...
It felt pretty stupid when i realized that if i want to play Medium Armored Barbarian i have to choose between not-so-effective AC, or looking weird in mail (or even worse Githyanki) armor. :-/
Dont get me wrong here, i like Githyanki armor ... its just not barbaric at all.

(And im still pissed off that there is no Gloves and Boots for us that would be fiting it, esteticaly.)
And why whould anyone wear any other Non-enchanted Medium Amor ... than Githyanki one? :-/
I mean ... what is purpose for Hide Armor, Scale Mail Armor, or Chain Armor ... compared to Breastplate, or Half-Plate in this game? :-/
The point of Hide Armor IS that druids have an acceptable replacement for studded leather. Most druids wear Hide armor.
Scale is top tier armor for those with Medium armor proficiency; providing a cheaper alternative to Breastplate. Breastplate is better because it's less weight and doesn't penalize stealth, but it's also 400 gp as opposed to 50.
Chain is often starter armor for various classes, and if you have 10 Dex or lower, Chain is better than half plate. It's also 10 times cheaper.
So, every armor is supposed to have it's place, but Larian isn't giving it proper place. That's why it seems like some armor is pointless.
Druids should be restricted to armors without metal - the game allowing them to use metal but warning that it is taboo for a druid to use metal.
Ringmail is actually an acceptable armor for druids (well, some DM's permit under certain circumstances) because it is not necessarily made of metal rings. It may be made with bone rings, or something natural. So, it can be a heavier alternative to Hide.
The point of limiting druids like this is that they are spellcasters, not fighters. So, by limiting their armor options makes it so that they aren't so freaking tough. Think about their abilities for a sec. Wild Shape for extra health and abilities, magic, and they can rush into melee. They're pretty freaking tough as it is. Now add higher AC so they're hard to hit. Suddenly, other classes aren't even a match. The druid becomes a spellcaster, tank, high damage dealer, healer... Everything. Restricting armor brings them to a better balance. Now they aren't SO OP.