Education

They still need to pass the pedagogy and practices test and content test in TX, at least.

The small engine repair and welding teacher ... What bachelor's degree would those be? Caltech has a program for that? Oregon State? U. Chicago?

And the program leading to graduating having finished your apprenticeship in machining, using milling machines and CNC lathes? Harvard has a machining degree? No--that would be UC Berkeley. (My high school class' valedictorian fell in that category. Not Berkeley. But he graduated as a master machinist. Started with a great pay. Had a student years ago who got a $50k/year job as a welder, supplemented his income with designing and building special projects ... Before he graduated his high. His inferior welding teacher--lacking the BS in Welding Sciences--trained him well. He earned more than me, with my MA.)

See the problem?

Now, you want somebody to teach IB organic chemistry? Yeah, get the degree.

As for hiring teachers with no teaching experience, you're right, that's stupid. It's like hiring an entry level bookkeeper that doesn't have at least 5 years' experience bookkeeping, or a trainee with no experience to build cars. But wait--if you can't hire somebody with no experience, how can anybody get experience to be hired?