its really an overused excuse if you ask me. they have stated this for many champions in the past like Udyr, Rumble, Evelynn, and now newer champions like ZAC and Jinx. they knew what they were doing when they were making these champions and since this has been going on for so long this really has no merits anymore. if its too difficult then either dont make champs that difficult anymore, or redo them to make it easier because nowadays its just empty words!
Its also the fact that they also claim that they dont really have designs for said skins which i along with the community has known that a lot of the community makes wonderful skins for various champions that usually goes unnoticed! and thats sad. because these people work hard on these skins and its basically for nothing! Now i understand with copyright, but i mean original ideas going towards nothing.
Then there are just simple recolors. i dont get why they dont do more of this. yes its just simple recolors, but its at least something. something to hold us down till the next (usually better) skin comes out. its just so simple either change the color, or do something small yet different between the default skin. it really shouldnt take that long to make any skin like that especially for a "difficult skin to make for champions"!
They have so many options and yet dont ever seem to take it. if they did we would have see a lot more skins nowadays, at least a lot of community skin ideas which i would be all for. Nut sadly in this day and age things like this are just too rare to see a company actually take the the community seriously!