Earlier quoted context omitted.
Care to provide any counter-examples? Please make it know if you end up using Wikipedia for your source of if Wikipedia's quality has changed
How in the world would you supply a counter-example for "the quality of Wikipedia has/hasn't improved substantially in the last decade"? I also can't even read the second sentence. I think there are typos there, but there's no mental correction I can do to make it coherent for me.
I'll go ahead and speculate that the number of incoherent sentences per article has gone down substantially over the last decade, probably due to the relevant tooling getting better over the same period.