I can't help but be concerned; I really love digging into this sort of thing. And while we do have various coloured gear, it doesn't seem like there's a whole lot of consistency with it regarding to how much more or less powerful it is compared to each other. I'd personally love to see the game's design documents.
My primary issue with the current itemization scheme is that, ultimately, it's kind of boring. Your next weapon will have more or less the same stats but just slightly more of them. There isn't any real choice as to what you're using, it's either definitively better or definitively not.
Now that said, this is really just "the beginning" of the game so maybe as Crystal Tower expansions and Coil expansions come out we'll start to see a more broad selection of gear.
Primarily, what I like to see from gear selection is gear that can adjust the way you play your game, letting your tailor your character a little different from the other one standing over there.
Just because a theorycrafter says "This is optimal" doesn't mean everything else isn't good though and should be ignored. For example, when I played GW2 my partner played a Necromancer with a heavier leaning towards healing and it ended up working out spectacularly. She didn't hit as hard as other necros could but she made it a heck of a lot easier for everyone on the team to stay alive. And she didn't use Berserker gear to do it.
It isn't "the impression" of choice, there is choice and if you know how to work with it can use it to play your character differently from the 12390857346 other players while still being effective.
And this! This is the kind of stuff I personally love. I love gear that tweaks your skills, moves you in a slightly different path, or heck gives you entirely new abilities!
I'm honestly not one for mid-battle gear swaps (excepting weapons) because it doesn't make sense to me to pull off your plate chest piece and then pop another one on mid-battle without any negative impact on you.
But I am one for tangible choice. I like gear to augment how I play and make my character play differently than another character of the same class.
MMORPGs are supposed to be about making your character yours. At least they used to be.