Adjusting the spark timing is more a right to repair issue. If you replace the screen of your phone with one of a working phone do you expect it to work or do you need the approval from a licensed apple technician?

A taxi is still a car but we use a different word to differentiate the mode of operation. The difference in language infers different usage of the same machine.

Therefore going by car is understood as something different then going by taxi. In relation to this issue, it's like you rented a car but you get a taxi instead (selected operator controls the vehicle instead of you). Most people would not be pleased.

The problem being that phone or tablet is understood to be similar to computer while really they are not. So perhaps a different term to highlight this difference is not strange or counter-productive. Do you call your "smart tv" a computer in daily conversation?