Personally, I have never had a question taken down or not posted by the mods even though English is not my native language.
In my opinion, there is no perfection in writing standards. There is always controversy as to how to interpret certain rules, and there are different approaches and variations of the language with different use of rules and lexicon (UK, Australia, Canada, US dialects). Add the element of style to the mix and you will have anything but a benchmark for perfection.
It seems futile and useless, to expect “perfection” in an environment like this. This is not an academic site, not everybody has various degrees, and some people do not like grammar—just like some of us don’t like math. So, it is preposterous to think that people who are not teachers or academics, and left school years ago, would remember what adverbs, clauses, or run-on sentences are.
I believe that it does more harm than good, because it can put people off participating and getting the help they need. In my experience, even in my native language, when I write papers for school, it takes me an enormous amount of time to write a “flawless” piece, double that if I am writing in English. So, when someone wants to share a problem and get support here, they probably don’t have time to check all the grammar rules or whatever, and just give up. So, yes, the strict writing standards can be off-putting, even though as a language teacher that is my area of expertise.