My hands are big enough that I will rest it on the trackpad, and that screws up where the mouse is on screen. Since I'm in Linux and have "Focus follows mouse" turned on, moving the mouse to another window means I'm not typing where I want it to be. And that's a bad thing.
No, better to have it disable the trackpad when I'm typing, and even better just disable the trackpad when I have a mouse in there.
Never heard of "focus follows mouse" before. Do you mind me asking why you use that setting?
It's something I'm accustomed to when using PCs when I was in college. The default window manager was FVWM and it had a "where you type is what window the mouse is in" policy, aka "focus follows mouse." I find that it helps track where it is. Besides, web pages are so bloated I can hide the mouse cursor in all that fat. ;)
Windows doesn't do that, alas... well, not easily.
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