60 degree wedges shouldn't be limited to 45 yards and in. No reason to limit the club to a pitch shot.
I have vokey wedges for anything 52 degrees and under. And I hit them all except for the 64 for full shots, mid range pitches, shorter approach shots at chips. The only reason I don't hit the 64 full is because I never bothered to practice it.
Why would you limit your 60 degree wedge to 45 yards and in? If you can take a full swing with your 56 degree wedge and hit it about 95 yards, why not just do the same with the 60 degree wedge and hit it 80 yards? It is really not that much different and is more consistent than trying to guess how much to take off a 56 or 52 degree wedge to hit it that distance.
Really doesn't have anything to do with swing angle or ball flight or anything like that. It's pretty much the same swing you would put on your 52 or 56 degree wedge.
methinks somebody never bothered to read this book: