I appreciate you trying to problem solve someone else's job so that your preferred solution makes sense, but have you considered that maybe you don't have all the answers?

Flights aren't cheap.

Contractors pay for their own transport.

Contractors aren't hourly.

Most small businesses don't have "fleets."

The "last mile" could be 6 hours from the nearest commercial airport.

Direct flights don't always go where you need them to go or leave at convenient times.

You're right about needing tools and supplies which was another reason flying was a non-starter, but a car is also a place where you can sleep in a pinch. If a job takes longer than expected, you might not be near a hotel, much less a charging station.

There are a lot of reasons I don't do those jobs anymore, and I love working from home now. Less than a year ago, I looked for an EV or PHEV that I could afford and would fit four people and a dog. There weren't any. That was my original thesis, that the cars are still too rare and too expensive for mass adoption. Charging networks are a sub-problem that requires attention, but fixing it won't fix the primary issue.