I think you're underestimating the mathematical needs for these trades. Sounds to me more like you're describing the needs for a job grunt and not the specialized trade.
Most trades can and do apply skills using various levels of algebra, geometry, trigonometry, calculus, statistical mathematics, engineering science, physics, dimensional analysis, blueprint reading, material and labor estimating, accounting, and so forth.
Oh I know that it's done...estimating can be done with calculus formulas. Even with "magic numbers"
Sq ft of previous job costs multiplied to SQ feet of job you are bidding on...any extras added in and then profits put on top.
My way doesn't use calculus formulas but it isn't out of the realm of possibility to be used for new construction or a complete rebuild of an office floor. Also for checking on how a foreman is really doing.
I've talked with the upper management about all these things being utilized.
They even have used them to check up on how I do...(they wanted to put me in a bottle as lotion and rub me on their others)
As grunt labor though most can do just fine financially without using anything beyond grade school mathematics.
You and I... well we are a bit different. We can and do go well beyond because we have enough wisdom to know how, when, and why we should use more advanced mathematics to go further.
The automotive glass guy I mentioned before?
He is not a bright guy. But he hired smart guys for those things when he started getting larger. His business exploded because he saw the need and with humility admitted that he didn't know enough. Hired the right guys and women to help him. Kinda a miracle really.
Everyone talks about him as being an exception to the rule. Henry Ford is discussed as being the same way.
He just recognized the importance of Peter Drucker's work. (Created assembly lines and work productivity guidelines)
They weren't new concepts...just a broad understanding of what they really accomplished.