I agree in principle, but in many ways that requires you have some knowledge of the history of a particular site or animal. Animals can obviously become habituated to people. There's a great horned owl nest I know of, at the top a a fifty foot tree that's next to a highly trafficked trail (walkers, bikers, horses). It's been used for at least six years that I know of and the owls and owlets seem unfazed by the mobs. I don't think anything about setting up tripod and 600mm right on the trail. From their behavior, the owls show interest in any small dog going by

But if I found such a nest out in the forest I'd be very careful to keep my distance for a long time. and it would take a few visits before I'd feel it was OK to move closer.