May be off topic, but yeah I think the Nether needs to be expanded. In my opinion it should be at least half the content of the Overworld. Look at these statistics:
• The Overworld has 36 unique mobs, the Nether has only 5 unique mobs.
• The Overworld has 46 biomes, the Nether has only 1 biome.
• The Overworld has 12 large structures, the Nether has only 1 structure. Even the End has more structures
So while it might not be as bad as oceans, I'd like to see more.
The Nether should definitely get a dedicated update.