It's not about how long the article is because it's all about how the message is conveyed like getting straight to the point. Well, there are some people who make the article going in circles before getting to the point. There's also some who did it because they are required to do so since some signature campaigns have rules like # of characters for it to be eligible because if not then the post won't be counted or not eligible to be counted.
I agree with you. However, whether a piece of writing is judged as quality or not depends on its content. If it is long but meaningful then that is also good. However, if the writing is related to technical matters, it might be better to just answer as necessary so as not to confuse things. However, when discussing opinions, it is necessary to explain and give examples so that the argument seems longer
That should be the case, but the problem with other replies is that it is full of unneeded words just to make the reply look long. Like citing an example that has nothing to do with the topic being discussed. I also agree that quality replies does not need to be long, it should be a direct answer that is need for the question may it be technical or opinion based unless asked for an example. This way the reader do not need to read a long wall of text just to get the essence or the idea of the reply.