Background first: my home course is a muni I've played probably 200 times. I know it cold. So yeah, this whole experiment is rigged from the start and I'll own that up front.
But I left the rangefinder in the car for 10 straight rounds. No watch, no Arccos (sensors are still screwed on the clubs, I just didn't open the app), no phone. Just a pencil, the card, and the sprinkler heads.
Scoring was basically identical. Averaged 81.4 over those 10 vs 80.9 the 10 before with full tech. So, nothing. What did change is I played faster, roughly 25 minutes quicker per round, and I thought way less. No standing over the ball second guessing because the watch said 148 and my gut said 7 iron. I just hit the shot.
The surprise was the two rounds I played at courses I'd never seen. I wanted the rangefinder back immediately. There's no gut feel on a course you don't know. That's the real argument for the tech, unfamiliar tracks. At home it's basically noise with a subscription attached.
Not selling anything here, I'm keeping the rangefinder for travel rounds. But I do think this forum (me included) way overstates how much of our scoring comes down to 2 yards of precision. Anyone else tried going dark for a stretch?