The issue isn't about books or crib sheets as such. When experienced musicians with established performance skills use them it is usually for exceptional reasons. In most cases, where they are used it is as an aide memoire and doesn't detract from the performance - the Joan Baez example illustrates how even an experienced performer can be caught out when forced to rely on them.

Neither are comparisons with different genres with different practices helpful, although as someone has pointed out the music is often there for visual effect rather than to be referred to. Also they are often performing much longer and more complex pieces of music.

The issue is use of books and cribs by performers who haven't developed performance skills or confidence, and whose continued reliance on them as a crutch acts as an obstacle to them acquiring these skills and results in consistently poor performances.