Huh? When did pages reduce to 20 posts? It’s been 50 every time I’ve logged in, with never a break. Not saying I could not have missed a week somewhere...
I asked myself that too. I've been here for 20 years. The only time I remember 20 posts to a page was when the server was having problems, and it was recommended to lower the number of posts on a page in your preferences so that the pages would load faster.