I have a laptop with a touchscreen. It's annoyed me for some time now
that if I touch the main message body control, it fails to switch
focus. Touch works just fine on the other controls.

I could just tab to body from subject when ready, or I could click,
when my touchpad isn't being temperamental, but I find myself often
wanting to just reach forward and tap the large message body area on
the screen to switch focus to it, but I can't because it doesn't work.

Touching the screen does work to move the cursor location within my
message body text however. The lack of focus switching seems to be a
bug or small oversight.