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Well, the most obvious reason why they won't implement them all is that code = $, often $$$, or so directors of human resources have been known to hint at...
The next good reason is that there is limited processing ability inversely proportional to the lack of patience of the average user.
Last, code space is at a minimum due to the inclusion of highly necessary high level and informative features such as the credits page, New user's guide, dual processing engines for epubs and kepubs and options for multiple time and date formats.
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