@rcopeh:

Should a president know how to change fix a busted cylinder head block?

no, but he should at least know how to drive a car and fill the tank.

Should a president know how to take a blood sample?

no, but he should at least know how to read a pulse.

Should a president know how to bake a five course Italian meal?

no, but he should at least know how to make toast, or boil water.

Should a president know how to construct an Ikea wardrobe?

no.... well, actually, yes, because Ikea furniture is ridiculously easy to assemble. But if not, he should at least know how to use a hammer, or a screwdriver

Should a president be tech-savvy?

no, but he should at least know the basics of using a computer and the internet.

Like somerandombystander said, every industry now uses computers and technology. Our world practically relies on it. Of course a president should know something about it! They don't ahve to be on the computer 24/7, but knowing the basics of how computers work and what they have done to the industry is IMO a must.