Here's an example of really bad UI design, on a critical (to me) component of the Mac:
The Bluetooth Firmware update has the following message:
Important - Please read before proceeding
Downloading firmware cannot be canceled.
Downloading firmware may take up to 15 minutes.
Don't let your computer sleep while downloading firmware.
Don't turn off your computer while downloading firmware.
Don't reset your computer while downloading firmware.
I've had the firmware updater running for about 30 minutes. There's no sign of life from it - the progress bar is doing nothing, and the status message is "Idle". But if I click on Quit, it tells me that the firmware has not been updated. And the bluetooth status icon in the menu bar shows bluetooth is unavailable.
So is it safe to quit? Should I reboot? Am I about to destroy bluetooth on my laptop two days before I go on the road again?
This is not a terribly satisfactory user experience. What on earth are Apple thinking?