I don’t think my kids have ever used a Windows machine. I have a couple of machines at home that both run Linux Mint and they use Chromebooks at school. There is not much software that they need that is not either a web page or also available natively.
I can already do this on my Samsung Galaxy S23. Has this been a Samsung-only thing?
That being said, Samsung’s Bluetooth UI leaves much to be desired, IMO.
Edit: Granted, it doesn’t work exactly as described in the article, but I can have multiple BT speakers playing the same content from my phone.