100% situation dependent on the trail pitch where you meet, who can afford space to yield in that moment, and who wants to. If I am approaching a rider and she/ he veers off the trail to let me pass before I have the chance to do the same, I just pass and say something pleasant. If I notice the other rider first, I give them space. It's a give and take dynamic. On some days, I end up not stopping for anyone. On others, I end up stopping to yield ROW to everyone.