Not sure. I wouldn't want a plumber operating on my heart for example . But we are short of them atm
However if tradesmen are sooooo useful, how come people are rude about them all the time? From using their toilets, to demanding too much tea or not doing the job fast enough Bloody thankless task doing a private job (as DH knows to his cost).
I suspect DS#1 will do something of that kind but after doing a related qualification. Rather than DH whose only qualification was a BEd