Yeah I agree 1000%, at least for New Zealand, any tracks that art super popular aren't on Google, but most are on OSM.

Not to mention, I find seeing Googles walking tracks kinda hard, especially if you're new to an area and want to see what tracks are around.

OSM often has things that are barely more than animal tracks. It's pretty awesome when you want to go exploring.

Yep, though I use All Trails when actually on the trail, it's fantastic. I just appreciate seeing trails (and trailheads as POIs) when using Google Maps for drives.