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When I started it seemed like everyone needed a MSCD or some certification but then people figured out how to cheat and made them worthless.

License requirements for those professions you listed are for safety of the public (and for the worker in the case of electricians). Without a basic level of understanding electricity will kill you. Without knowledge of the body you will kill the patient.

Doctors, Lawyers, etc can act as notary so they are given additional powers and must follow a code of conduct.

Anyone can lay concrete, anyone can chop down trees, can paint/grass cut, lay tiles or put in a new floor. Electrical or Plumbing require a license because it would be dangerous not to.

Lawyers, accountants, financial planners, etc are licenses because they represent a public trust.

I don't think developers fit into any of these categories. Scientists or artists do not need a license to do their craft. CEOs don't need a license either.