"Annie and ashe cant get new effects because they're 750 RP"
Then what about a bunch of other skins that have special effects on them such as Coral reef malphite, shamrock malphite, leprecaun viegar, lil slugger trundle, monarch kogmaw(new walking animation), spooky gangplank(glows), junkyard trundle, etc.
So those champs (plus maybe more) get special add-ons but the new skins like sweetheart Annie and marauder ashe cant? Plus even the new Varus skin still has his old voice/auto sound.
Riot don't make excuses, just do it for your fans.