I think it's well scaled, but finding a rarer item is often times meaningless
I do find myself keeping three backup (usually epic) weapon sets for a raid but that depends on your playstyle
However, a legendary drop of the item class is usually something you will find yourself keeping for a long time. I've had The Holy Avenger drop with 260 durability and by the time it broke another one already dropped, and I had other items to fall back to as well
This was on a modded run though so take that into account as well
I think for now this hints to a speedrunner of sorts so best routes will always be important. I usually hunt down that Magnificent wizard guy for his ring as one of my first things on a new run