Stardew Valley is certainly impressive for a one-man project and a success, but hot take, it's not that good in the grand scheme of things. "Jack of all trades, master of none". You can't overcome physics and the human lifetime.

Certainly, one can be a jack of all trades, and certainly, there's value in being so, but you're giving up mastery which has its own value, and comparatively, having multiple specialists collaborate is better than having multiple generalists.