that's not a solution tho - I obviously was asking about being able to play with old save a new content and as I presumed - you can't do that. First answer obviously BS then - so why people talk such misleading nonsense if they don't know?

In which case - playing right know, especially going all-in into building doesn't make much sense if you'll have to start new world with every new biome update - and I don't think they'll drop them all at once, more like 1 by 1, meaning if you want to experience new content on release - it's 1 playthrough now, and then 1 for each biome update - and that is just too much to ask from most people.. Also why then prioritize home customization over delivering remaining biomes ASAP - and then perhaps adding new customization with already existing materials which would then never require to start a new world if you don't wish to...

That is why I prefer Raft system - which can work retroactively as it's not seed based generation. I've sunk ton of time into building my raft and when chapter 3 is release - I can use my raft where I left it.