The fictional R2-D2 had a big advantage of being in vacuum so it could work from the outside, without disturbing the airflow, and without having its work disturbed by the airflow.
Envisage what happens at 900km/h in atmosphere, if R2-D2 tries to lift up an exterior wing panel to troubleshoot a blocked line?
Even car maintenance doesn't work like that anymore. There's almost nothing you can do just by crawling around and messing with the parts there.
Clippy was an assistant, built to help me solve problems I didn't understand, and built to help computer illiterate people use their computers more effectively and was made out of genuine expressions of making their product better for more people.