Unless you are independently wealthy, you are beholden to your employers. Sure, you can always jump ship and find another job, but whatever you end up in you will ultimately have to do work you don't enjoy from time to time, or play politics to keep everybody happy... or deal with a coworker you don't like.
Certainly you could try to operate that way in a traditional job, but you would quickly be fired.
If you were truly your own boss you would have 100% discretion in everything you do, have 100% autonomy to make design decision, technology decisions etc.