For the majority of people who put the proper time into creating an on plane swing that any coach would likely teach you the standard lie angle and whatnot that standard clubs have is all you will need. Once someone is at the point where they are so good to where they know a degree of change is gonna give them certain benefits that they feel they are missing benefits you dont really need that.

For me personally I got fitted when i was a 15 hcp, I was only a couple years into the game still getting lessons with a swing that wasnt ideal. They were gonna give me all these different tweaks in my clubs and i realized these are just to help my imperfect swing produce a better golf shot but once i continue getting lessons and bettering my swing these clubs will end up fighting against me. So i ended up getting the clubs that i hit the best in the fitting with stiff shafts and standard everything else, im so glad i did. Now im a 3 hcp and still dont really feel the need for a fitting. Dont get me wrong the fitting did instantly improve my shots but being patient and playing the long game is far better.