Yep. I've also seen a datetime picker (in a log viewing tool) where adjusting time from keyboard is nigh impossible: you have "12:30:00", with the cursor right after the "30", and want to make it "35", so you press [Backspace] — nope, deleting a digit would make an invalid time, so the component undoes it. You press "5", but inserting yet another digit would also make an invalid time, so the component undoes it. You have to text-select the zero, and then press "5" to overwrite it... and you have to do it digit-by-digit, because you can't replace two digits at once with a single key press. Amazing.

It's a lose-lose situation, honestly.