I have thought out another possibility. It is that before the cropping, we choose some criteria that the seed must have. They could be, at least one or two savanna M+ (or whatever it is) within 3km, etc. I could then generate a seed, check whether it fulfills the criteria, and pick the first one that does. That seems like a better idea to me than sitting and judging subjectively whether everyone get good enough terrain nearby. If people want that, they should write the criteria that they think I should judge the seed on, which would mostly be which biomes that should be there I guess.
My proposal would look something like:
- There must be at least 1 savanna M+ within 3 km of spawn
- There must be at least 1 savanna, flower forest, etc. etc. within 4 km of spawn
- Reject seed if a single pre-1.7 biome (or deep ocean) spawns that cover more than 1.5x1.5 km within 3 km of spawn
And maybe
- At least one new stronghold should generate in the new land
but that would mean I knew a lot of things about the landscape and stuff without exploring that myself ingame.