In the Alvin and the Chipmunks movies, the Chipmunks and the Chipettes are global pop superstars. They're basically the Taylor Swift or Bruno Mars of chipmunks, yet outside of the first movie, it never really plays into that part at all. In fact, they don't even feel famous. It's such a wasted opportunity because that's the core concept.
Would it be cool to have commentary on child stars in the music industry or how fame at a young age isn't healthy? Sure. But I wouldn't even say you have to go that far for a kids' movie. At the very least, have the plot revolve around their singing or their fame.
You see them sing for maybe two or three scenes, and that's it. Even then, they're usually just covering popular songs. It would've been cool if they had done something like Smile 2 or a Disney Channel movie and written original songs for them. But, as I said in my previous point, the movies don't really delve into the pop star angle at all.
In the sequel, they literally go to a regular public high school. Why? They're international superstars. Why are they going to a normal public school? If you wanted to have the chipmunks go to high school, it would've been much cooler if they attended a performing arts school similar to Hollywood Arts from Victorious, where they're the most famous students, but everyone else is also an actor, singer, dancer, or performer.
Then, in the third movie, they just get stranded on an island. Why? The core concept of Alvin and the Chipmunks is that it's about talking chipmunks who are world-famous singers, yet they don't even feel that famous in their own universe. Alvin even says, "I'm more famous than Mickey Mouse," but you never actually see that. They don't feel anywhere near Bruno Mars-level famous. If Alvin were really more famous than Mickey Mouse, then there is no way in hell they'd be able to go to a public high school. All the students would be filming them, wanting to be their friends, asking for autographs, etc. Paparazzi would swarm the school, and crowds of fans would be waiting outside. Yet you don't see any of that. They don't even feel B-list famous, and the story establishes that they're global, Taylor Swift-level famous.
You rarely see them interacting with fans, getting chased by paparazzi, performing sold-out stadium concerts, or dealing with the realities of being celebrities. Even Hannah Montana leaned into the pop star angle more than these movies did.
These movies would've been much better if the plots—even the comedic plots—actually revolved around them being huge stars. Road Chip could've been about them touring 48 countries and all the funny situations they get into while traveling. The sequel could've been about them signing with a new record label, dealing with being overshadowed by the Chipettes, and ultimately coming together to win a Grammy or something.
It's just such a missed opportunity that it makes you wonder why they made them singers in the first place. With how the movies play out, they could've just been normal talking chipmunks, and almost nothing would have changed.