It's like Jeff Bezos said:
"I always tell people, if we have a good quarter it's because of the work we did three, four, and five years ago. It's not because we did a good job this quarter."
This is a pattern that I've (anecdotally) noticed in successful entrepreneurs and programmers... the ability to focus on the long term at the expense of the short term (but without sacrificing the short-term).
Long story short, if you are in an employment situation where your employer will not let you spend any more time learning new things, you should consider employment elsewhere.