That's an excellent caveat. You do need to accommodate the "house style" of publications.

Even that can be helpful, though. Early in her career, Joan Didion wrote fashion copy for Vogue: very brief captions for clothes that had to adhere not just to Vogue style but to strict space limits. She's written about how she had little or no room for her personal style but found the work valuable because it taught her to cut all the fat from her writing.

But as your comment implies (if I'm reading you correctly), you need to have the temperament for it or for, say, newspaper work. Not everyone does. And the catch is: You may not know whether you have the temperament for it until you try it.