One pet peeve of mine is that these old systems are often trivially navigable with a (often custom) keyboard, then replaced with something that needs a mouse.

One pet peeve of mine is that these old systems are often trivially navigable with a (often custom) keyboard, then replaced with something that needs a mouse. So 'tap, tap, tap, tap, enter' becomes 'tap, <locate mouse> click, tap, tap <locate mouse>, click'.