I’m sure a lot of people so defer to the short articles. But, the most “popular” length here is (supposedly) 7 minutes.
When I see an article that’s 10–15 minutes, if it looks interesting I bookmark it to come back to. Often, it’s the long articles I end up going back to read again. (Food for thought for me, incidentally, so thank you for that)
But you’re quite right that neither brevity nor length is any indication of quality. There’s good and bad in both.