Since my day gig involves project management, I look at everything the same way: Determine scope, develop strategy, enlist tools to support strategy. Same for my golf game:
Wedge Scope = reducing score; Strategy = keeping ball from getting inside 80 yards of hole; Enlist tools = wedges that hit 110, 100, 90 and 80 shots effectively.
That said, my PW is 45, GW 50; SW 54 and LW is 58. In the rare instance I end up with a 60 yard wedge shot, I use the 58 and open it up a bit.
Used to have a 60 LW, but didn't see much application for my approach to the game.
PW, GW and SW (for the most part) are used for full shots. The 58 is my weapon of choice around the greens for hitting higher, softer, closer to the hole shots. Other clubs are used for pitches and chips when needed, but I like to keep the same wedge in my hands as much as possible for shots around the green.
dave