"Back in the day" when down tube shifters was the only thing available, when standing to climb, one had to always sit down to shift, then stand back up.

There's no way one can stand, using bar ends or DTs, and take your hand off the bar and reach down to shift. At least I couldn't and never knew anyone who could.

For touring, when I used bar ends, I never had the need to stand so it wasn't really an issue. The coordination thing is quite real, even when sitting and climbing, you had to be careful when taking a hand off the bar to shift.

I had recommended brifters for the tourng bike rebuild, but in the end (no pun there), she decided with bar ends, feeling that the even slight chance of trouble wasn't worth it.

To each their own.