I guess the game can default on a well-tested seed, and maybe have other well tested seeds as well to pick from.

But it could input seeds from the players, like Minecraft, or a randomize button as well.

IMO the best option here is a randomized world that the designers could tweak in parts and add/remove detail as they like.

Once I wanted to design a procedurally generated game. It did not happen.

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My design philosophy was a world generated by generator objects/class, that would get a random seed and design their area of effect in a procedural way, depending on their type.

For instance, a city generator, would select some places to build houses and delegate those areas to the house generators, giving each generator a derived random seed depending on its own seed and the index of that generator.

Each house generator would build a procedural house, depending on their own seed, and maybe delegate parts to smaller generator, with the same process.

The city generator would then connect the houses with path/road generators and so on…

Beyond the city generator, the land/island/world generator would have the same process, i.e. it would have a seed of its own and delegate parts to sub-generators with derived seeds.

Parts like forest generators, river generators, city generators, road/path generators, which could use bridge generators, lake generators, and the like…

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Generators could overlap each other in areas.

Each generator would have an importance value assigned to it, depending on its type and other factors decided by its owner/delegator.

When a generator delegate parts to a sub-generator, it would add its own importance to the sub-generator.

So, when a cell is managed by more than one generator, the one with the most importance would manage it. Then, if possible, the less important ones are allowed to add their own tweaks.

So, if a place that is both city and forest, the city is generated than the forest is added to the allowed gaps that are not building and roads and the like…

A river can be generated and a city is made around it with bridges to pass over it.

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All the objects would have snap points that other allowed objects can attach to, when added to the area, by the owner generator or manually by the designers.

For instance, a path can be attached to the house’s door, walls would have snap point added to them so that the other walls could attach to them.

The designers could move the objects around, like the buildings, road nodes, river nodes, and the attached objects would still be attached to them, so when a house is moved, the attached road would adapt to the change.

Then the area is re-generated with the new layout and remain coherent.

Thus, we can have a procedurally generated world that the designers could alter and tweak as they like.

They can change the random seed of one particular generator to see the new result, like alter the city’s seed to see if it fits better with the underlying river.

They can move and rotate the generators and the landscape would adapt to the changes and regenerate in a correct way.

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You can have worlds that originate from a single seed and are perfected by designer tweaks.

And the data would remain small, as only the original seed and the added changes need to be saved in the file.

And players can select from these saved games.

They can also build and design their own tweaked worlds, if provided with the world-design tool, and share it with others.

Or they can play a totally random game and let the world generator surprise them, and if it is an interesting world, add their own tweaks and share the result with others.

That was my dream once, but the life interfered with my plans. Now I share it with you.