Depends on the golfer. No general rule of thumb here. Jim Furyk was one of the best iron strikers, and he did not have a one plane swing. Honestly, golf instruction or concepts need to just stop using this one-plane or two-plane swing labels. Just find what works for you.
I live in Tallahassee. Playing Windswept Dunes this Friday. It's in Freeport, north of Santa Rosa Beach. Will give a report after I play, but it is supposed to be spectacular. The only courses I have played in Destin are Kelly Plantation and The Links Golf Club at Sandestin. The Links course was fun. Short and a ton of water.
I'm watching this video where it mentions that dechambeau switched to having more bend in his trail arm during the backswing, which has stopped him from being on a one plane swing
Is he's correct in saying that this results in more power?
Would there be any disadvantages in increasing the bend in the trail arm during the backswing, so it's no longer a one plane swing, eg would it reduce consistency of hitting the ball flush?