Programming skills are more universal and don't depend on the country. Whereas lawyers and doctors have different standards and laws to operate on. It would be

Programming skills are more universal and don't depend on the country. Whereas lawyers and doctors have different standards and laws to operate on. It would be tough for immigrant to justify to spending 4-7 years studying laws of another country just to take a chance with H-1. If you fail to obtain that you virtually unemployable by your country and need to spend more time learning laws of you country