Noted without comment that these are all predominantly white, male occupations.
Would you say the same thing about dish washing, fruit picking, house cleaning or school teaching? Does that alter your thinking about whether or not "trades" make money? Does it make you want to argue about what constitutes a "trade"?
I'm not so much calling your wrong, just pointing out that the perspective here is skewed. Arguing that "blue collar work is just fine" by pointing out to one particular, historically dominant in-group maybe doesn't make the argument you think it does.
In the modern economy, we need to staff a lot more restaurants and schools than we do pipe fitting crews. How does your argument change when you look at those occupations?
Edit to clarify: the point here is that you can't fix things by having more people go into car repair and pipe fitting and plumbing because those jobs are already taken. We have plenty of plumbers in our society. Why? Because as the grandparent mentioned plumbing is a desirable job and it pays well.
And, being a desirable job, it's, yeah, been monopolized by a particular subgroup within the larger demographics. So to a white dude, the "just be a plumber" advice makes more sense than is really appropriate.