Well, I don´t think they are all ruish, but I do understand many fans´ dissapointment. Many, really many companion disc tracks are nearly identical to the original ones.
I own no studio bootlegs, but from what I have read, many fans would have prefered already heard stuff in good or slighly sub-standard quality rather than these alternate takes in pristine quality. And with his idea, I think JP has betrayed himself. LZ was, to his own accounts, all about feel, improvisation and spontaneity.
Therefore and IMHO, yes this was a missed opportunity.