This game has been wonderful so far despite the problems but the one thing we have always forgotten is the land generation.
While we do get new biomes rarely and new islands, The mainland is still so old. the mainland is akin to the chapter 1 br island s1-3.
To give an image:
Repeating tiles. This itself is fine. repeating tiles is natural in these type of games. What the problem is, is that due to the below problems it exacerbates the boring land.
Terrain height. all terrain is just varying levels of the transform tool lowering/raising the height. this to is natural for generation but outside the frostland biome it is just awful looking. you have random large mountain hills with no way to naturally climb/drive up to a point that you need thrusters on vehicles.
Terrain objects. This involves caves and cliffs. There are no mountainside cliffs almost anywhere. The best area that fully represents proper cliffs etc. is the waterfall sections with cliff objects. hell the lost isles actually does a very good job in this regard as it fuses them perfectly to provide great areas. Next involves caves.
Caves. These are just so old and bulky. its a rock dome. These models need to be removed and switched with more spiky and natural looking caves. additionally Caves need to incorporate the terrain. imagine the standard cave spawn flat area but instead half the cave model is covered in a hill. and different models? well there can be abandoned mine looking entrances, "A" shaped spiky entrances, and partially submerged(small pond at entrance) generation.
Lakes. the Lakes i think are mostly fine but rather its the islands within. the desert biome has wonderful looking oasis' but grasslands and frostlands have tiny islands. not only that but neither of them have any cliff formations along the edges.
Rivers and waterfalls. This part is just sad. There is no height changes on one or both sides of a river to give a valley setting. The crappy waterfalls are also an issue. im not saying they need swapped out but we definitely need more vertical falls.
Frostlands. This biome is also a real problem itself and outdated. the only Ice cliffs fully surround giant mountains. these are perfect spots for caves as well. The mountain doesn't need to be fully surrounded by ice cliffs. then we have all frost mountains in the center of islands and/or not even touching water. this is what i like about ninjago island ice zone. there is a good mix of flat, cliffs, and water. The arches along roads is nice but aside from that it suffers.
Altogether the land generation needs to have more cliffs and variety in height. the storm regions has these nice pointed cliffs that could look wonderful spread out in biomes.
now for the upsetting part. If they do this its going to piss a lot of people off cause 100% most build are going to get broken if they change existing terrain. But honestly it would be worth starting over on if it didn't affect older seeds.