Paying down a rental fast vs using the cash flow for other invs.

[Ted Felsberg]

Hey everyone!! I’m new here and new to investing. This is actually my first post!

So here is my question. I have listened to over 300 of the podcasts, I've read dozens of books, and gone to a few meet ups. I haven't heard of anyone talk about paying down a mortgage early. I assume it is because the math dictates that there is a better option for using my 200-300$ cash flow for something else. Now after saving for CapEx, vacancies, emergencies etc, what's wrong with me taking that $300 and paying my mortgage down? All I keep thinking about is taking a 30yr mortgage down to a 15yr and saving a ton on interest. Or getting it down so low that I can use a heloc to pay it off early and just make the heloc payments. Then when I am 100% paid off I can borrow against that property for other investments.

Is there something that I am missing?

Thanks in advance!