Several of us have been experimenting with Altantis Word Processor which outputs epubs. That may the appropriate tool for someone who doesn't understand HTML and CSS and doesn't want to.
The complaint is that Sigil is not a Swiss Army Knife. Those of us who use it recognize a scalpel when we see it. And like a scalpel, it takes knowledge, because with the Regex Search and Replace you can cause the ebook patient to lose both its heart and its mind, along with your own in the bargain.
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