The residential buyer is the source of much less repeat work, is harder to deal with, more price conscious and harder to collect from than the commercial buyer they could be working for.
Anyone that can competently market, manage, and execute that small job can do the same for better customers.
The crew that can build a driveway cannot build a parking lot, and they will never be able to break into that market because it requires experience that a driveway cannot give. From a parking lot there is then road building - the previous companies cannot break into them. Again there are just not enough projects of the size that sits in between to build experience.
This is not true at all! Parking lots are not particularly complicated, with the main obstacle being machinery and logistics. I know folks that started off residential and moved to commercial once they accumulated enough capital to buy the necessary machines to take on bigger commercial work.
Highly questionable premise. I bet very few people are going to gamble their most valuable asset on a newbie trying to learn the ropes. I’ll pay someone experienced multiples more for my once in a decade or two capital projects on my home.