I think
disdain is a very strong word - it's more frustration at the individual(s) who complain about the same issue that has been addressed ad nauseum without bothering to read the very extensive threads describing the problems with book view...
The individuals who come here complaining about xxxx not working in Book view, or I have this very weird error that happens when I xxxx in book view, or why does book view cause my book to xxxx.......
Book view was broken.
It couldn't be fixed without
extensive work from the
volunteer coders maintaining Sigil.
Sigil was not meant to be an authoring tool.
Most regular users of Sigil never used Book View because the preview pane made it almost redundant.
The Sigil maintainers were kind enough to provide Page Edit to accommodate the very few who couldn't live without a typewriter
Cheers!