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The other thing is there's regulation everywhere. Window manufacture and fitting is regulated. Insulation fitting etc. etc. With electrics the skills required are commonly underestimated. If it was easier there wouldn't be a shortage.
Airhead-
IMO let anyone do it, and those who can't install and test competently can still hire electricians. To be fair, part P hardly covers anything now. But enforce the law severely if anyone, electrician or not, doesn't follow BS7671 to the letter. Competence instead of credentialism.
On a related note, how does one become an electrician? I am a software engineer working in the energy sector anyway. I have been thinking about starting a company installing smart home systems with custom software and being a qualified electrical installer would be handy.
Invent
I think it should be a case of caveat emptor. Reviews, personal recommendations to find the most skilled people. But regulating who can and cannot do certain skilled tasks always pushes the prices sky high. Even for those other roles you mention.