This model works well for trades and notably is absent any real management - sub-trades are hired to deliver on an outcome, not to be "managed " and they take responsibility for the quality of their work.
Construction tradespeople I know would not be interested in demand generation or fintech software or whatever else this article is pushing. I'd expect the same from shrewd solo operators, that are focused on doing their trade well and not on getting caught up in management activities. I say this because although these sound attractive to the management class, I think selling SaaS management tools to solo operators is a tougher nut to crack than people realize