This isn't meant to help users directly. As Joe notes, no software vendor will claim to run
on any old LSB4-certified system.
However, ISVs who code to LSB4 -- i.e., rely only on what's documented to be present in LSB4
-- will find porting to any LSB4 system will be easier than what they have to do now.
Typically, now, they have to build release packages on some ancient version of Red Hat, and
then rely on forward link compatibility to run on new Red Hats, and everywhere else too.
With any luck this means they can rely on newer OS features than they previously had access
to. E.g. does LSB have futex?
If this works out, users will benefit by having a wider and possibly more modern choice of
targets certified by the ISVs, because it will be cheaper for the ISVs to port and certify.
ISVs benefit by being able to sell into shops that run distros they hadn't previously been able
to afford to support.
Anyway that's the theory.