Currently a lot of equipment models are not visually optimized so mix and matching causes a lot of visual errors or they simply don't look good. They either don't align properly or clip through eachother or outright have models cut off completely.
For example wearing any armor while barefoot has ankles visibly cut off, so there's a huge gap. Or the Absolute Gloves that clip through Drow armor and some others. Or Scale Armor +1 stretching its forearm leather to infinity.
I'm sure they will address this eventually once the optimization process starts for the entire game. And I hope they do because I pay a lot of attention to such miniscule details too. This is why I would also love the transmog system implemented into the game, to avoid mismatching equipment visually. One thing I dislike with RPGs is looking like a walking dumpster by not having a matching unified outfit ^^
