Emirikol said:
Naming them at all seems kind of like the level names of 1EAD&D. I think they should have MORE names than just the three..and perhaps there will be..but only as a 4th party supplement.
jh
I think for the purpose it exists in the game, the 3 names are the right number.
Their purpose seems to be to make clear what kind of game you should expect. There are certain types of adventures that will fit best in a specific tier.
Such tiers didn't exist in name in 3rd edition, but they existed in spirit, even if not clear-cut and certainly not in the "10 levels each"-division.
There basically was a "Prestige" tier at 6th level upwards, where you were finally able to qualify for prestige classes or really managed to fulfill your character concept (if it required a lot of multiclassing, at least). If the PrCs were associated with an organization (which in practice didn't seem to be enforced much, though) the characters became a part of something greater - having chosen sides and their purpose in the world. Leadership became available at the same level, meaning you also carved out your place in the world (at least if you actually took it.
)
Another tier was implied by the kinds of spells that were available. At 9th level, Wizards got Teleport - the game was no longer about long travels, and it began to span the whole world, not just the local area.
Once Discern Lies, Divinations and Zone of Truth appears, certain adventures (mysteries) became a bit more difficult to manage (though they might also get enriched by some of them, if taking into account)
Plane Shift indicates another tier, the point where characters leave the mortal world and might change (or have to fight to preserve) the world, interacting with demons, devils and possibly deities.
Epic Levels were a tier that was consciously added into the game (it was a very "mechanical" break, because it changed how classes advanced, mostly probably because the system broke down in several areas. It might actually have broken down earlier...)