Actually this is not true within the medical community.
Primary care physicians are the gatekeepers, they refer patients to specialists, and the specialists depend on them to get their referrals, hence the primary care physicians are treated with kid gloves.
In the same vein, the cardiologists will direct skin cases to dermatologist. It’s not about the complexities,it’s not what they are trained for.
The PCP is the diagnostician, which requires far more skills in the real world.
They are less well paid because the medical world rewards procedures.