The maps were removed for a reason:
Pokemon:
- Unbalanced with amount of chests on certain islands
- Layout was poor, middle almost unachievable. The spacing between certain pokeballs were further than others.
- Players often camped
- Pixel art
Biomes:
- Map was too big and rarely filled up
- It was not up to build teams standard of quality
- The games lasted too long
Unfortunately the maps are not coming back, you can always hope for a revamp but I can't guarantee this off course;).