Its obviously there to gate progress to keep fresh content/environments so you have to do the PvE before you can really progress to DZ05/DZ06.
Ultimately once youve hit level 30 those 2 DZs are where youll be spending pretty much all your DZ time - no point in playing DZ01 with NPCs half your level and no doubt DZ05/06 will have the best loot drops...
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But once you hit 30 doesn't the whole DZ scale to your level. Even DZ01 scales up to near your level. Then DZ06 is full of rank 32 elites I believe?