It’s manifestly evident that this is NOT the case. Classic simply continued with minimal disruption beyond people whining on the forums.
You could farm devilsaur without stopping on a low pop server too.
The boss resets were clearly a bug, and people got banned for exploiting it.
You couldn’t mine the same node. Different layers had different nodes.
You couldn’t pick the same herbs in two different layers for the same reason.
Once again, the effect of layering was to reduce the effective population.