I would tend to say that Apple's basic design approach is very much a minimalist approach oriented towards the casual reader, someone who might read 10-20 or less books a year. Such readers generally aren't interested in lots of bells and whistles.
In general, if you are real picky about things like margins, then you would be better off using a 3rd party app that is oriented towards customization.
Apple does have a way to buy fonts in iOS 13 and add them to your iDevice.
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