Vanilla is a product of Lussumo:
Documentation and Support.
So it's going to be that sort of day, looks like.
And we really should be careful what what we term a "real book". Something printed on paper with a cardstock cover shouldn't make it anymore "real" (tangible/acceptable/normal) than a digital version.
I have many of my books in both formats and they are quite real to me.
I may not have discovered many of my now favorite authors had it not been for digital versions available for my various readers. I embrace both formats because I understand that there will be people on both sides who will refuse to read the other, but I can't excluded one group or readership over another just because of personal preference or bias.