Static putter loft won't tell you actual launch
The instructor explains that you cannot predict a putt's launch from the putter's static loft, because a lot depends on where the weight is and whether it sits high or low. So being one degree of loft in one putter doesn't mean you'll launch the same way in the next.
Channel: Club Champion
Watch official source at 19:20Why this context matters
From an in-depth putter fitting session comparing different putters.