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It is more like artificial boundary.
Kindlegen maximum output file size is 650MB. KCC code don't have any size limits. But after extensive research I noticed that in many cases so big files cause big Kindle slowdown (even on newest ones). So unless you want spend 3+ seconds to turn page creating so big files is not very good idea. Even 400MB files are already somewhat effected by that slowdown.
Additionally I consider 650MB files are not practical considering that a large part of Kindle users have only ~1,25GB storage on their devices.
In current version splitting of MOBI output is not optional and you can't disable it without code modification.
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