According to my observations, long posts are sometimes very tedious to read. I very often see the indignation of users that it would be nice to shorten a thought in the text, especially since it carries a lot of "water"
But when it comes to merit, great posts are sometimes also rated more for effort than quality. So yes, I agree, all that is needed can be said briefly but clearly. It is the most convenient and not fatiguing in terms of reading.
But I also vote for good large texts that explain some points in the most accessible and understandable way.