The local obscenely named utility company dug in our road a few years ago, necessitating a large patch. They proceeded to drive through their patch as they left. The tire dents & ridges are still there years later. You're right, of course, but I think you may be overestimating the concern patch crews give to their craft.
That's ... How you compact a patch.
Anyhow, it doesn't matter how much care they put into the job, if the substrate fails the road fails. Simple as that. Patches are temporary fixes.
That's a method in the manual - "roll-and-go". The fact that it's still there years later is actually proof that the patch was effective, if maybe not well applied.