Years ago I worked in the Car Factory in Oxford, British Leyland, as it was then. It's 'maintenance teams' consisted of many different time served trades, in the various fields.
Fast forward to today, and I'm a maintenance operative, not in a manufacturing premise, but nevertheless one that has many different services and systems. When I first started there a few years ago, I used my electrical qualifications & skills. But I soon learnt that was not my role. My new colleague mentioned, he 'done the 17th' as well, so he was an electrician and also done some work there. Well, having seen the work, he's not.
Unfortunately, a lot maintenance operatives think they know everything there is to know about the systems and services in their premises. Truth is, we are the 'Jack of all trades, and the master of none'. What we do well though, are the myriad of simple fixes, compliances and keeping the place going.
So send them on an 18th, HVAC, fire alarm, heating, gas, CHP, warden call, BMS's etc etc courses, and do away with the contractors. But have time for nothing else.
If the OP's premise, is like the car factory, you'll employ an electrician from the beginning, perhaps as an apprentice. If not, you'll employ an appropriate contractor.
So I agree with the H&S Manager, but for different reasons.