Success. It was software. I think maybe I upgraded 3 successive OSes. Normally I do a clean wipe but I got lazy. Or maybe it’s some confluence of settings. Whatever. I got a new keys, which have more rise than the old ones. Plus a new battery. I guess it was worth the trouble.
In general I would say overrated. Closer to the hole is the general determining factor for success in putting.
But... and there is a big but here, it really depends on the given green and the hole location on the green. There are some greens and pin placements were it definitely is better to be 10 ft away with an uphill putt than 5 ft away with a downhill one, especially when the greens are slick. IMHO.