Yes, exactly. It always felt weird to me that I can't have a (legendary) bard that might make it his life mission to learn every song in existence, just like I'd think a wizard who wants to learn every spell should be a possible concept, even if that wizard needs an entire library of spellbooks on their private demiplane to hold it all. For a bard to be like "I'd love to learn that awesome magic song you just played but I don't have any spells known open" always felt off to me.
Compare that to a Sorcerer - they aren't learning about music or magic, they're learning about themselves. Learning every spell is pointless to them, because what they can't do is as much a part of their identity as what they can.