I played with the 10-fingered grip for the first 20+ years. Then developed a cut on the outside of my left pinky finger about 6-7 years ago, which was so sore that the only way I could continue to play that summer was to implement an interlocking grip. (I'm a lefty).
Rather than take a month off to let the cut on my pinky finger on my left hand recover and heal, I dabbled in an interlocking grip change.
After about 20 minutes of shanks and pulls - I finally got a feel of how my wrists should work together versus being prone to work individually with the prior 10-figered grip. It was undoubtedly one of the best changes that ever happened to my game, as I found a degree of control that I'd never experienced with the prior grip, with my hands suddenly working in unison.
It took me a few rounds to fully trust it... a few rounds several strokes higher than my handicap, which is usually the case when one makes something as significant as a grip change. But after a few weeks - it started feeling more natural and I started experiencing a much more neutral ball-flight, a high ball-flight (which for me was a good thing).
Won my club's championship that same season, 5 months later.
And I've never looked back.