Using technology != technologist in this context. Calling a doctor a technologist essentially makes everyone a technologist and the term becomes meaningless.
You are welcome to pose a definition of technologist that included the people you mean to include and excluded the people you mean to exclude, but by any coherent definition doctors are as much technologists as IT workers in general, though I can see some reasonable definitions that would exclude most of both and only include a few of either.
But, in any case, the lack of formal ethical rules applicable to IT is not about how necessary technologists are or aren't compared to doctors.
But, in any case, the lack of formal ethical rules applicable to IT is not about how necessary technologists are or aren't compared to doctors.