Ellen DeGeneres’ 2014 Oscars tweet got its picture back, but most others are still broken.
X glitch wipes out most pictures and links tweeted before December 2014::Ellen’s famous ‘most retweeted’ selfie from the 2014 Oscars has had its image restored, but most old tweets have broken short links instead of the media or links that should be there.
I don't think anybody seriously used twitter as storage.
Rather the point is that, similarly to every time a blogging platform or another online service with user content shuts down, a bit of internet history disappears with it. Links are broken, traces of opinions or bits of knowledge from another time are not available anymore...
It's not the end of the world, and at that point I wouldn't really care if twitter disappeared completely overnight, but still, some stuff will be lost.