> What makes mp3 still worth considering?

A lot of people (including myself) won't re-encode their existing music collections into another lossy format to avoid degradation in sound quality.

Also, as much as it sucks these days, a lot of people (including myself) are still in the Apple ecosystem (formerly iTunes, now Music.app). For these people, mp3 seems to be the best compressed format that's compatible with the rest of the world.