From an idealistic or individualistic point of view, why should we choose open formats?

Should I keep using mp3 files? If not what should I pick.

Are there any debates around what we should expect from open formats?

@aral By the way, nowadays I usually refer to servers as gardens. I believe this will make owning a garden sound a lot less technical and a lot more fun. It would also create expectations of ease of use.

As example, freedombox and yunohost are aiming to be such garden operating systems. And Pioneer Freedombox is a garden.