PC Gaming

I'm not sure I understand what you're referring to. If by "three tiers", you're talking about pre-Hard-Mode, Hard-Mode, and post-Plantera, I don't think that falls under what is typically meant by "level scaling" (I realise you didn't use that term specifically, but people up-thread did). Level-scaling would be if a green slime, which dies in 2-3 hits at the beginning of the game, grew stronger alongside the player such that later in the game, it would still take 2-3 hits.

I'm not saying this just to be a persnickety asshole, but instead to make the point that Terraria is so great because it doesn't have the kind of scaling that Oblivion and many other open-world RPGs have. I love how Terraria has no qualms in repeatedly bitch-slapping you back to spawn if you insist on heading into areas you're ill-equipped for (and the tiered progression ensures that there's nearly always some such difficult place, even as the player levels up). I also find it interesting how the tinkerer's bench acts as a key driver of progression by allowing you to pack more accessory function into fewer equipment slots.

That is to say that unless I'm misunderstanding you, I completely agree with your points, except that I would consider this to be an example of good progression without level-scaling