This is not how good managers think. They're not building good employees, they're helping build incredible team members. This isn't some altruistics BS, it's because the attributes of a great employee are symptoms of the indvidual. If your manager only cares about your bottom-line impact towards your job, start looking for a better situation.

Exactly and while the employee may appear from the untrained eye, to be "going nowhere" they may well be quietly gaining skills of highly marketable long term value, in fact having time to learn stuff properly due to lower pressure. So everyone wins...

I have seen the thought "employers are responsible for skills growth of their employees" and I am with you on this.

Employees need to take responsibility for their career and growth. I am responsible for continuing my learning and maintaining my skill set. To that end though, I choose to work places that encourage and support that since it's in their own interest.