The green matters as well. On my home course, some are flat, easy to knock in backwards. But some greens have 3% slope or more. On those, I can easily miss a 1 foot putt if I’m not careful—certainly not a gimme for me.
My observation / experience is that providing a golfer gives a putt careful attention, 2' is to amateurs what 3' is to pros - 99% make. At 3', the make % goes down a little so these should be putted out. Unfortunately this has applied to me as well.