Why give champions the same skin over and over?

Sorry if I’m missing the point or something here correct me if I do

But why why why does riot give skins to champions who have a lot of skins already? Like why? Champs like udyr, xerath, ornn, Zac, skarner, those people

I can understanding not giving udyr a skin because dude needs a serious model update but come on udyr’s model is as old as jax’s Model and god staff doesn’t look that bad so I don’t understand why udyr can have another skin

And if riot does decide to give skins to unpopular champs don’t make it half ass like mecha asol or dunkmaster Ivern if u enjoy those skins I’m not gonna judge u but imo those skins suck

And what about ornn he’s been out for 2 years now I believe and still has no skin while lux gets like the 13th skin and a prestige in the span of 4 months, same with kaisa,ezreal, and pyke

It just annoys me how I see the same champs get skin every damn year while other champs don’t get a skin or a half assed skin