I should elaborate, I'm fine with a "simple design", and much prefer simpler designs to complex ones (e.g. most 90's jerseys, Thrashers old uni, Panthers 00's ones etc were all awful).
For great simple designs, I cite the iconic Pens jerseys, the Bruins, Habs, Blues, North Stars as examples. But the mentality now, at least with the newest Canes, Stars, Kings and Bolts, was "Make the whole jersey the same solid color and slap a single white stripe on it somewhere." That's just lazy and not creative at all.
There's a middle ground between the new minimalist jerseys and the overly complex jerseys that needs to be found. I like the Jets uniforms, and they're relatively simple, yet not absolutely boring like those other 4.