Let's not. There's enough overcomplicated nonsense examples of cybersecurity in movies as it is. If you could compromise a device via bluetooth, then you could exfiltrate data via bluetooth just as easily.
you could but I think the inclusion of lasers would make for a better spy / cyberpunk movie. Most "hacking" in movies are not realistic and for show but it being plausible is just a bonus.
It's not completely unrealistic angle, you could pwn the speaker when someone is traveling with it in public and then exfiltrate data when it's plugged in a secure environment and you can't connect anymore