It’s more of a narrative / mythology around going into uniform.
The jump from CI to uniform isn’t that much & if you are doing lots as a CI then it make sense to go into uniform if that what suits you.
It’s the jump to CO where hours go stupid.
the bit that the organisation is guilty of & is part pf the origin of the myth round the uniform expectation is dropping those who are new into uniform straight into an OCs post.
It burns them out without any time to learn & understand their uniform role.