Dr. David Delnegro MST USMLE Tutor
The obvious answer is how would schools know that you took that gap year to slide into the new system? You could easily give a number of answers to why you took a gap here, and because it is so common, not a soul blink twice.
That being said, Step 2 CK is still scored so there’s still an inherent risk involved. One of the best parts about step one being scored is that you had an opportunity on CK to improve on it.
My best advice to use to gather lots of opinions. However, personally I would say to not use this change as the sole or major reason for taking or not taking a gap year.