So you're min/maxing and complaining that things are being min/maxed? Nobody forces you to do anything. That's like saying the game economy sucks because you loot everything there ever was.
Two points here.
The complaint isn't really that things are "are being" min/maxed. The complaint in general is that the game promotes and rewards min/maxing, so to the point that it's hard to even make an argument as to why not do it.
Second, the comparison to the broken game economy isn't apt, in the context of PoE, because you will loot everything there ever was. I'd see this argument in some games, like D:OS, where there could be an argument that if you loot everything that isn't bolted down, including random cups and such, you're going to "break" the economy by using it in a way it was not intended. In PoE, however, you have an infinite stash that you can access anywhere at any time. If you don't loot everything, the question really is why.
I always use variety of armours, usually heavy for front liners, medium for skirmishers and light for back liners and find the current system decent enough. Added onto that are look and feel of course, which are quite important to me as well.
The thing is, just because you do something one way, even to the detriment of yourself, doesn't mean that there's no issue. Yes, it's entirely possible to gimp yourself and still play through the game. Yes, it's entirely alright if someone wants to limit themselves for the sake of roleplay or a fun idea. I should know; my first character is likely going to be a duelist Paladin specializing in Resolve, dressed in nothing but cloth.
And that's fine. I realize that this is sub-optimal, and I accept it as it is, because I'm willing to bite that bullet.
But it doesn't mean that there's no issue. Just because I say "I'm going to use one-handed light weapons even though it's objectively terrible, because I like the idea" doesn't mean that being a duelist isn't inferior, or that light weapons aren't bad by comparison. And it's the same with armours. Just because you will be using medium armours doesn't mean that medium armours are balanced.
When someone comes onto the forum and asks us "What armour should my character pick?", there should be an argument, there should be a discussion. What does he want to do? What does he want to be defended against? What does he hope to achieve? What kind of character is it? X is good at Y but Z is good at A, B, C, but you might want to consider Å, Ä or Ö for rape prevention.
But today, it boils down to "Nothing" vs. "Full Plate", depending on whether he's a DPS/Caster or a Melee Tank. If the only argument for the in-betweens that we can collectively come up with equates to "Chill out and do whatev, like, man", that is a problem. Yes, you can probably make it through the game, it's not like you're pulling the trigger to your head, but you could probably "make it through the game" playing as a murderhobo vagrant with a pogo stick.