Cover art, album documentaries, if you really wanted to you could use modern technologies to just produce that. In fact, the quality could be some much better compared to a small booklet.
For example, you could create a high fidelity website containing audio material, video material, images of highest quality and so on. You could present those using top notch flash technology and intuitive ways of navigation. No booklet could come close to that except for being physical. You could even try to imitate a brick and mortar store by including the download button in such “booklet”-sites.
Of course the art of music seems to be fading away with quality becoming lower by the minute, but you can also state that new technology often is worse where the older technology is better and vice versa. The audio quality is worse (where the older is better) but the mobility is better (where the older is worse).
It’s also valid to question whether the old times always were better since, for example, the vinyl imho had a worse audio quality, let alone music cassettes. But that is a question of personal taste.