The detour leads to absolutely stunning pools and is certainly not useless. Definitely worth doing. You only have to walk the last 150 meters downhill towards the river. It's a bit steep in places, but not dangerous.
There is significantly less going on here than on the middle "Sentiero Single", as there are a few hundred meters more to climb. But the view is all the more spectacular. Absolute recommendation in the Tavignano valley.
Very beautiful rocky valley where the road is close to the river. In the low season there is little traffic, so that the enjoyment factor is high with the bike.