There is nothing necessarily wrong with separate areas of scope, but unfortunately in this context the concept of "limited scope" has come to mean plumbers trained to remember the difference between blue, brown,and g/y 2 times out of 3.
Open your eyes and take a good hard look at the electrical industry and you will find it isn't working already, yes we had the NICEIC's defined scope many years ago and that was the start of the crack moving on it is not all that clear what is needed to be a D.I. recognised by a CPS as competent to carry out electrical work
You don't expect your GP to be able to carry out brain surgery.
I expect him to have sufficient knowledge of
all areas of medicine to point me in the direction of the right specialist, although my old GP was an ex surgeon who changed direction and went into general practice and actually did some minor surgery work at the practice a few afternoons every month
You don't worry if the guy driving the bus you're in isn't qualified to drive 30 tonne lorries.
Not quite sure what your point is, although I do know an electrician who got out of the trade changed his day job and does have a licence to drive buses and when you look at a bus it is truck chassis with a container mounted on it to transport people which may get to 30 ton depending on how obese the passengers are
Maybe it is worth thinking about whether it might be easier to raise standards if they were more granular, if there was something between "can point to a photo of a screwdriver and identify the handle" and "can do absolutely everything".
Isn't that what we have had for the last 15 years fragmented and partial qualifications and standards have dropped through the floor maybe if we rewound the clock by 30 years and maintained the standards and levels of training then I doubt we would be even talking about this now
By its very nature, experience becomes "defined and limited", so would it in principle be a bad thing if training and qualifications did likewise? It certainly isn't when it comes to experience - for example, who would most people rather have to rewire their house, someone with 20 years experience of doing that without destroying the decor, or someone with 40 years experience of nothing but factories, workshops, oil rigs, and power stations?
Are you really suggesting that experience is not interchangeable across different sectors of the industry if so you are greatly misguided, I have had 45 years in the electrical industry as a contracting electrician across many different sectors covering industrial, pharmaceutical, commercial, healthcare and domestic to name a few and they have all added something to my available skill set. During my apprenticeship I worked with some very knowledgeable and experienced electricians which gave me a good grounding to build my own skills
Your experience of this industry is clearly very shallow with regard to the rewire the guy with 40 years factory, power station etc experience every time the job will be done with total over kill I have seen a lot of them work the only thing that more often than not frightens them off rewires is the farce that is Part P