Topaz may be dreadful, but Amazon does need to have a solution for embedded fonts that brings it up to par with ePub. If Topaz ain't it, they need to extend mobi (ideally by copying what ePub does).
As it is, mobi format can only use one typeface (well, two if you count the fixed-pitch font that's used for computer code, etc). That's pretty limited. I don't know how frequently embedded fonts appear in ePub, or which readers actually support them, but at least it is supported by the standard and there are tools that support it.
Maybe it is just my good luck, but all of the more recently published books I have sampled or purchased seem to all be mobi format. I might try a survey/sample of the most recent books added vs. older ones to see if it is some sort of trend.
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