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I would guess they leave the extra CSS because it does no harm (besides slightly increasing the epub size), while removing something that turns out to be useful later just leads to even more work. Better safe than sorry.
It also it makes it easier to create a book without being an expert. You can hire cheaper people to do the job.
Last edited by rkomar; 04-11-2017 at 02:29 PM.
Reason: Fixed "higher"
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