LSB was more than that. It was a set of standards declaring what you can
find in your typical GNU/Linux system.
LSB was always somewhat controversial when one tried to apply it to any
non-rpm distribution (LSB mandated rpm as package manager), personal
tastes (LSB mandated both Qt and GTK+ installed) or a common sense
(not every server needs CUPS contrary to what they think).
What's true - one does not need LSB if one writes free software. LSB was
designed for all those proprietary software vendors in mind.