When I started at Apple as an engineer, the first bug I filed was "Can't resize windows from their edges" (or any corner except one).
Just mind-bogglingly stupid. And when Apple finally does capitulate and admit that others have done it better, they petulantly try to hide the functionality anyway. In the case of the windows, there's no window border and the cursor frequently fails to change to the "resizing" one.
In the case of two-button mice, Apple came out with a mouse that hid the second button and in fact was nearly unusable because the entire shell was the button so you couldn't lift the mouse and keep the button held to continue a scroll.
And on and on.
Oh, and then Apple added Alt-Tab-style app switching... but it's often useless because when you Command-Tab to an app, Apple doesn't restore its window. It remains minimized and useless in the dock. There is a utility called Alt-Tab that lets you fix this, at least.
And those are just a couple...