It could be good, bad or neutral. Whenever a movie gets delayed, it's usually seen as a sign the movie will be bad, and they rewrote and reshot it in a desperate attempt to salvage it.
The worst scenario is if they are struggling to make decent songs.
The best scenario is like you say, they wrote good songs and now they are making sure it's good.
But there is also another factor. You can stay with a piece of art too long and get bogged down, making it worse rather than better. Or get tired of listening to it.
Or maybe they are listening over and over again to see the longevity and timelessness of the material.
So many variables.