Loot scaling is probably the most common scaling in all RPGs, there are lots and lots of chests everywhere with random loot depending on the level.
Those chests should be scaled to the danger level of the area, so we have newbie areas with newbie loots, and a minimal chance of finding high level loot there.
And there should be high level areas with a chance of finding newbie to high level loots in those areas with the emphasis on lower level loots, and some boss containers with high level loot stash in them.
High level loots should be scarce but more probable on higher level areas, but some boss containers like the personal stash of a boss monster, should have a 100% chance of finding good loots.
Edit: typos.