If you mean anything that is an ARM (as opposed to fixed rate) you are wrong.
Until last year I had an adjustable rate loan that was interest only for 5 years on a rental property in San Diego (oooh, SCARY !).
Unfortunately, since I am conservative (from an investment point-of-view) I made the mistake of refinancing into a fixed rate loan last year at 6.25%. If I had kept my “dead meat” loan my reset would have been below 5.25%. I’m pretty sure I would have been OK paying a couple hundred per month less on my loan. In the long run I guess that’s the insurance I am paying to keep my fixed rate.