That's a really good way to put it! I imagined if any pre-release stuff was included in the final, it'd be in a separate menu, E.G. final version of Cream Cheese Icing in Story Mode, but in free play mode you could choose to play the OG song and beatmap(?), something along those lines.
It's weird how I actually do feel pretty nostalgic for the 2021 version of the game - it's only been four years ;-; But ofc I'm hyped for how you and the team's experience will lead to a more polished and fun game in the end!