I'd always used the 10-finger grip, probably because of my competitive softball days back when I was a kid. Then back about 12 years ago I suffered a deep cut on the outside of my left pinky (I'm a lefty), and it became impossible to manage playing with the 10-finger style, as it would open up due to the friction from the index finger/golf glove on my right hand. The only option I had for the foreseeable future was to change my grip, if only temporarily at least until the wound properly healed.
At the range that day, I tried the overlap, and felt as though I had no control... really struggled squaring the face up on every club, on just about every shot. Then after about 15 minutes of realizing that wasn't gonna work - I tried the interlocking. Hmm... that's interesting. It still felt somewhat awkward, naturally, but my ball flight was both higher and straighter. And no dominant left hand (which had usually been an issue in the past) with the left hand rolling over and causing hooks! Suddenly it felt like my hands were working together and subsequently my swing felt more connected.
I experienced the odd lateral or two for the remainder of the range session, but for the most part I was striking the ball fairly pure. Good enough anyway to experiment around with it for a few more range sessions.
But that following weekend I still didn't trust the new grip style, and went against my better judgement with going back to the 10-finger. I wrapped the wound on my pinky with medical tape, hoping it would suffice. But it didn't, as the cut reopened and started bleeding again. I had no other choice but to trust the new grip change after that, otherwise I was gonna have to wait a few weeks before playing again. Interestingly enough I hit the ball about as well as I had in years during that round, and although it would take a couple more months before the change felt completely natural - that was that. That's how my one-and-only grip change evolved, from ten-finger to interlocking.
But... here's another interesting twist. My pitch shots and chip shots - I never made the transition with the interlocking on those shots. For whatever reason. Out of a green-side bunker? No issues with the interlocking grip. But around the green from whatever lie, partial shot or chip? Skull-city. So pitch and chip shots are still 10-finger, but full swings everywhere else - interlocking. Not that it's a big deal, most people I've played with for years probably don't even realize the difference.