1. Stand alone version with current player base would bring less money to jorbtar
2. Don't compare to Stardew Valley, it's most retarded way. SV is so succesful, because for long time, there wasn't a decent game that would make it up for legacy that Harvest Moon series has built around it. On top of that, You might find similar stuff but it's completely different thing.
3. You will be always behind with your friends unless there's a lot of You that You can basically start a faction yourself. You don't have to bot. Without botting, my village could stand up in game of rising Q carrots, unless bad RNG started to happen. Then, later quality of clay hindered further our process. Botting helps a lot but it doesn't make You guaranteed first.
4. Standalone version would rip apart small, stable player base.
5. Gameplay would be way different knowing that world is yours for taking and only animals can hinder your process. (without bigger and stronger adventures, only underground would be a "somewhat" problem