One drawback of composing all content via blocks is that the ability of copying and moving a full post can become a bit harder. We support Cmd+A and Cmd+C if you are not focused on a block. I think we can, in addition, offer some clear tools for this in the ellipsis menu while at the same time exposing keyboard shortcuts for quick copy-all.

Furthermore, we could consider having a "Export as..." menu there for quickly generating a plain text file, or an HTML doc for the post, etc.