So like theres something that doesnt make sense

Because some characters have no place in the game with recent updates, and others are obscenely strong. An example of each would be and .

technically the meta is a theory of how to play the game the optimal way but a majority of people use it. Only in competitive there is a small "meta" pool because they are just stronger than everything else. In solo que and anything below challenger 5's there is no meta because the people are not good enough to where you HAVE to use the best resources or you will 100% lose. With that being said there are no small amount of champs you can play anything in solo que/5's unless you are challenger. Also most fo the champions get patched/balanced every couple of weeks so that new champions become stronger than others but for a majority of the time for you and a majority of the people it doesn't matter you can play anything and have the same chance to win as the people the same skill level as you.Hope that sums it up.

A Meta is something that develops organically as people work out what tactics are strongest among the pieces provided, some champions will naturally rise to the top.

I wrote this in a different thread:

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So I can't watch the video at the moment and this next comment may be entirely out of context but:

No. League right now has 128 champions and counting. In order to make sure that this vast number of possible champions and champion combinations have any meaning to them, each champion must fulfill a particular niche for the job they do. Of course however, not all niches are made equal. Reset champions who backload a lot of their power budget on the ability to sweep teams for example are incomparable to engage champions that intentionally frontload their power to give their team a head start in a fight. Yet, we can always tell when one is definitely better for which situations. This is only balanced in the sense that Rock Paper Scissors is balanced. Yes, you will win RPS approximately 50% of the time based on random chance, and maybe League's more convoluted Rock Paper Scissors Spock Interactions can be balanced so that each individual player tends towards a 50% win rate in an environment that reflects their skill level, but the fact remains that interaction per interaction, Rock will always lose against Paper. Scissors will always beat Paper. I don't even know what Spock does but I'm sure it relates to my analogy as well.

On a micro level, League must always maintain these imbalances so that each individual champion has a place. Even if the game is ever statistically balanced on a macro level, there will always be matchups where one champion is clearly better than another in a certain job because that's just how you need to design champs in a game as large as League. That's simply the reality.

So what does this have to do with a meta? Well, simple. One niche in particular looks or maybe even is favorable due to, say, item interactions or how objectives are tuned. Everyone begins to build around or to directly counter that niche. Champions that fit well or counter the niche become common meta picks, champions that may objectively be balanced fall out of favor.

An example of noticeable niche changes between different environments is Sona in non-professional and professional play. Sona could have a 54% win rate at Platinum+ Ranked levels of play, but because professional play looks towards more consistently reliable champions than those that may be strong but have significant weak points (aka, Sona's squishiness, which pros know how to abuse), Sona is almost never seen at high level since her rework. Lee Sin on the other hand is the exact opposite problem. He sits at only 48% in Platinum+ ranked However, because he's so well rounded, he has no significant weaknesses despite apparently not appearing to have the raw potential that Sona's apparently showing off. Again, this is not a matter of say, a champion necessarily being weak or strong. This is just a matter of some sort of bias, be it strategic or numerical, that simply causes some champions to be picked over others when the alternative option may in fact be stronger in some areas. Pros like reliable champs over strong champs, sometimes the meta greatly rewards sieges or split pushes or team fights but maybe not all of them at once. Or hell, sometimes people just buy into the hype like a new champion or a large multi-champion rework. That's just how players create the meta.