It frustrates me too for the same reason, but for many apps the majority of users isn't advanced enough to use keyboard input to navigate dropdowns, so dependin

It frustrates me too for the same reason, but for many apps the majority of users isn't advanced enough to use keyboard input to navigate dropdowns, so depending on your userbase it might make sense to do it. Especially because with this trick you're already trading the minority's UX for that of the majority anyway.