1) Teaching a kid to weld is wonderful but not at the exclusion of teaching English, math and other subjects.
2) Exactly, yet why should the public schools not be able to impose those same standards?
3) Which is precisely why your brand of "school choice" is opposed. You want public funding of private entities (aka crony capitalism). That mission could also be accomplished by simply removing all school taxes, but you seem to want to keep the income redistribution alive and (essentially) privatize the public schools.