Pedantic, you don't know the distribution, so the chance could be higher

The reduction was specifically to the in-window side of the edge, so it's definitely greater than 14%.

Interesting, I've always approached from the outside in.

I approach from whatever side the mouse happens to be on...

never thought about it before but after playing with it a while i notice i tend to approach from the right, which means moving out if i'm inside on the right side. i think this is because my positioning accuracy seems to be higher moving leftwards than rightwards...

We can safely assume they're more likely to be close to the edge they're trying to grab than some random location on the window

Aim wider: why window and not screen?

Yeah, and not to mention the increase in likelihood click events the user intends for the application will make it through successfully, rather than being stolen by the window manager.

Technically correct is the best kind of correct.

I had similar thought but didn't want to be that guy.

My take is sometimes we get paid to be that guy and precision has its place and value.

We get lost when being right is seen as having value - instead of improving clarity and precision if needed in a specific context.