>>979114 out doesn't hate cairns in general just the tourist, "free spirit ones", that litter the landscape.
real one have a good use for navigation, when there is a reason you can't see the trail / markers, for example when you have frequent snowfall, or you cross a solid rock area when you don't have vegetation to be trampled into a trail.
Pic related
it can really suck if people build random decoy ones everywhere