The childish part of it is HOW you stated your ideas. It came off as a childish tantrum, where the child yells over every attempt to put things to right and refuses to see anything other than exactly what it wants as a potential solution.
If you want something taken seriously, list it off in a calm, almost detached way. With clear evidence and points. Not a stream of angry words.
Like your numbered list. Listing something as 1.(point)2.(point)3.(point) looks a lot less thought out than
1.(point)
2.(point)
3.(point)
It allows your message not to be confused, while also giving those who disagree with you an easy way to find the points they wish to contest.(which is important)
You also listed way too many absolutes(everyone, all) and made some very incorrect claims.
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Not everyone hates the dynamic queue, just the people that want to do it solo. I didn't do ranked before because then I would have to choose between my sisters on who to play ranked with, and that is a terrible idea. Now we can play together. So why would I hate it. I don't even have issues with Dynamic queue when I play by myself, but I also am a laid back and rather positive person, so I don't rouse my teammates ire a lot.
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The balance team sucks because they have made quick, hard decisions before and ruined some champs, so they decided that a slower approach would be better. Which means that the necessary changes will take longer.
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admitting that you did bad or lied is terrible for a company to do. And unless their product had hurt people there is no reason for them to do that. And yet, they have admitted that they did stuff wrong multiple times on multiple things.
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The chances of everyone abandoning league in the near future is rather low...