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It is not blind. It is just that Sigil is not completely epub3 aware yet. You can easily mess up an epub3 in Sigil using the Index generator, using the MetaData gui, using the glossary generator, by adding an empty xhtml file via the gui, using the ncx generator, even just by using a named entity such as a nbsp, etc. Sigil's epub3 support is a work in progress that is just starting. The main work so far has been in tearing out almost all of the internals and then rebuilding them from pieces that support html5 natively.
At some point not too far down the road, there will be a Sigil preference setting that will determine if things default to epub2 (like now) or epub3. That change has simply not happened yet.
Hope this explains things.
KevinH
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