Champion skill caps

Hello, Riot ! :) I've been playing LoL for 5 years and imo the champions are quite easy exept few. When you finally announced the new champion with the elements I thought it will be something like Invoker in Dota 2 (with a lot of spells) but when you released gameplay of it and you showed it's spells - it felt like the champion have just 3 abilities. They are all quite similar. I thing LoL needs more champions with higher skill cap. I decided to play some Dota 2 last 3 days and I saw extremely high difference between the champion difficulties. Maybe you should do a champion who spawns more creatures and control them like Meepo or Enigma from Dota 2 or champion that has more spells like Invoker. You should definitely add subgroups imo. It's just way too helpful to have them. Me and a friend made a list with the hardest champions and that's them:

Riven (She has a lot of animation cancels, a lot of combos and takes a lot of mechanichal skill to be mastered.)

Shaco (The mind games you can do with his boxes and clone are just so good and hard and if you are good with him you can definitely make a difference.)

Akali (She has to make a lot of usage of her passive and play perfect in the laning phase. She is also hard in the late game where you have to do a lot of clean pick us. It just takes ton of practise to be usefull etc. She is getting quite a lot of nerfs tho.)

Azir (He is super hard to get into and super hard to learn to play him properly even when you have the basics.)

And the last one is Lee Sin (He has ton of mobility and combos which you have to master even if you just wanna play him normally. His kit has a lot to offer which makes him deffinitely one of the hardest champions in the game.)

That's the list we've made. Other champions seem like they can be learnt and mastered in no more then 15-20 games. I hope my opinion have inffluence or at least be taken seriously. Thanks for the time! :)