I realize the great and most important problem with current league.
It's simple but not short.
In the past you had more time and opportunity to make your skill and knowledge accumulate advantages through lane phase.
It actually came very clearly once I saw an old replay of me.
Think about that particular situation: you are playing an off meta pick that don't have the best stats this season. You have so many lane phase to work around and time to get stronger that you could adquire a very meaningful lead or wait for an specific power spike that would allow you to carry.
Because you had so much lane phase time to make your skills turn into advantage, a lot of one trick ponies would succeed even against the worst match ups because they had clear and meaningful opportunity to have their skill turn the table and stack advantage [even if they didn't have a meta pick].
Today we made lane phase faster and added damage to the equation in such a way that you have less opportunities to punish, to make mistakes and to try to showcase your skill. Because we are not rolling the skill dice 10 times, but like 2 times now, we can't see a true meaningful skill average in the result of the lane phase.
You have like, a very good top lane player getting ganked and losing all the opportunities of the world to showcase his lane phase skills.
In the replay I saw, I was in diamond 1 playing rammus top winning against a GP just because of skill, Today we have so many resources and options that don't require skill that this kind of thing was made almost impossible.
To further clarify, by skill i mean basically timing very well how to harass, farm, movement, use fog and all other common resources you can to your advantage.