I believe The Beatles: Rock Band came the closest to being perfect. Eveything about that game was just beautifully done and the only things missing was Pro Drums, an option for Keys, and a few more Beatle songs (Hey Jude, Strawberry Fields Forever, Yesterday etc. etc.)
Seconded. A little more performance on the Switch to help with clarity and frame loss would go a long way, maybe better rewards for some quests and challenges, but otherwise the game is damn near perfect IMO. I’m well over 100 hours in and I still get blown away by stuff I discover, or things that the game is capable of.