I believe you Lanny. My arccos lets me know when I don't catch the ball in the middle of the face and you can see a 10-20% drop in the resultant yardage from my average.
Back in the day I got custom fitted for AP2's. They eventually got swiped out of my storage locker, but my parents bought me them as a present. I felt terrible, so I bought the identical model and never told them as a replacement. I couldn't remember the change in lie/loft whether it was +/-1 degree etc when I was fit, so I just went standard. It never made a difference.
What did make a difference over the years was getting footspray out to see where my impacts were, and of course lessons. I've put the work in video taping my swing and that has helped me find more consistency than bending my lies (I do play forged clubs).
Where I do think fitting matters, and what is probably being lost here:
1. Grip size (clubs/putter)
2. Shaft flex
3. Putter length
4. Wedge bounce (I also have my wedges 2degrees delofted which gives me less of a gap between my PW and 52 degree (now 50degree...Facebook marketplace deal on a Vokey).
5. Shaft length
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