Well yeah, the problem is a large portion of tradesmen are often misguided or just wrong on like every topic in the first place. My experience with welders and specific types of electricians, for example, is mostly filled with extremely misogynist people who take pride in ignorance. They aren't very reliable for opinions on education or even common sense. Of course, this doesn't apply to all tradesmen by any means, but those who aren't like this are likely to get strongarmed into acting the same or just get bullied out of the field. Like these are professions where employers will decide to not hire you based on the vehicle you drive, you have to conform to this "culture" of theirs in order to be taken seriously.

Something which doesn't really apply to "lower" skill welders, but I've heard from some "higher" skill (pipe/aerospace) welders, is complaints about not being able to do basic arithmetic&algebra or understand trigonometry... I'm not ripping on them, but they've seemingly had a lot of annoying situations and wasted a lot of time because they don't know multiplication well, and don't understand the logic behind the mathematics that they frequently encounter in their job. Sure, a lot of times the mathematics in trades can just be measuring and reading schematics and nothing else, but some work needs that kind of education and most tradesmen just seem to not have it.

Other types of education involved with communication, psychology, sociology, etc. can be extremely important for these professions, even if they don't affect the manual labour itself. A job is usually a lot more than just doing the work you were tasked to do, you have to actually discuss with people, and a lot of tradesmen completely lack skills in that department to the point it frequently causes issues...