By giving the agent its own isolated computer, I don’t have to care about how the project gets started and stored, I just say “I want ____” and ____ shows up. It’s not that it can do stuff that I can’t. It’s that it can do stuff that I would like but just couldn’t be bothered with.
Other than that I can’t really come up with an explanation of why a Mac mini would be “better” than say an intel nuc or virtual machine.