Have you ever noticed how eager people and systems are to stick you in a role and keep you there forever? For example, I see many jobs advertised where one has to have experience even though a reasonably intelligent would already know the general parts and could learn the rest rather quickly.
It has been pointed out that some models of business structure are based on WW II militaries. There were few people who knew how and a lot of people had to be trained up fast. It is not the same situation in an office yet this same model gets used over and over.
If you had to do something that you did not know how to do and you really wanted to do it, how long would it really take before you could get a decent product out? I suggest to you and employers that the answer is much shorter than most think.