Comment by bityard

Given the choice between the window manager making all of the positioning/size decisions and allowing the app to do it, I'll gladly pick the WM. In the opposite world, sure, most apps will behave sensibly but then occasionally you're going to run into that application where the author says, "hey, my app is so great, you're definitely going to want it full-screen all the time!"

An exaggeration of course, but I have seen plenty of apps try to do "smart" things about window management on their own, and they always get it wrong. It's one of the reason's KDE WM allows you to to override and make permanent a surprising number of settings.

(I also believe that websites should not be able to just do whatever the hell they want on my computer, but that battle seems to have been lost.)