I skimmed the thread VERY quickly, so apologies for duplication…
Writing skills are in short supply everywhere, and if you have an interest in writing, expanding your ability to express ideas and thoughts in words will ALWAYS pay dividends. I could argue it is even more important in STEM students, and that it will differentiate you in the workplace.
It’s also a great conversation piece on job interviews. I think it shows a curious and active mind away from the rigor of engineering. If you want to do it…you should.
The balancing issue is going to be one of focus for a minor vs. being able to take a few more courses of varying subjects you may like to learn something about. That said, I think a creative minor under a technical major is a great combination. Good luck!