Well, I'm glad we got that cleared up.
Though I'm a bit late to the party, I wanted to add my bleat. Namely that I don't often use book view, as the uhhh... PV does just about everything I need along those lines, including pointing out badly-formed code on the page. (it is a bit quirky about displaying embedded fonts and a few other visual things, IIRC.) Basically I wouldn't miss it if it were gone.
Having the ability to paste text from the clipboard directly into Sigil is a nice feature sometimes, though, so I support the Pasta Buffer feature.
When it comes to actually
composing something I prefer to use Libre Office, and convert that to a fairly clean epub with the Writer2xhtml plugin.
To me, adding or modifying text in BV is flying blind (as to what is happening under the hood). Makes me nervous.
Albert