I kinda agree with the old guy. At first I thought why a pitot tube on a massive airliner and not a computer or sensor that can calculate it all. Same with the altitude measuring device, why not having sensors to see its EXACT altitude. How reliable are pitot tubes? Do they show EXACTLY what the EXACT datas are? Say for the speed does it ever get things very very slightly off? Like if the very EXACT speed was 25.34586735689 knots and it shows 25.1729643956738.
Just an example