Most flying schools probably include the CIR as part of the standard training programme because they're aiming to produce a pilot that meets the standard airline requirements, rather than what may prove most practical in the GA world.
So what? I found that my CIR at 200 hours was invaluable, not because it necessarily opened up any jobs, but it made me more situationally aware, disciplined, accurate, and considerate in decision making. I would be genuinely suprised if the vast majority of new CIRated pilots and their instructors did not observe that change either.
How is that a disadvantage to employers in flying an aircraft as a professional??
Lancer