I gather BusyBox is intended for use in embedded distributions only,
not "normal" ones constrained by backwards compatibility.  In those
situations, it would replace a bunch of commands.

I would imagine the idea would be to reimplement it as an alternative
libcmd for use with ksh93, in an environment where ksh93 was the only
shell.  In principle, that could reduce the entire set of separate interactive
commands needed in such a restricted environment to one.

Also, an embedded system with ksh93 might not need certain other software
(like perl or maybe even awk) to still be flexible enough to do what it needed
to do (provided ksh93 doesn't get too bloated with all the enhancements,
or that it could be built with some of the bulkier features disabled - again,
just for special environments).

Since ksh93 is powerful enough for many purposes, extensible (even to the
point of adding a GUI as in tksh), and embeddable, it could collapse into
itself a lot of other functionality scattered elsewhere, and might actually
be of considerable help in producing a minimized special purpose
environment.  Whether that would actually work out for any particular
environment would probably have to be tried to be proven.
 
 
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