You may be interested in reading this post about the process of packaging Steam.
tl;dr: It’s mostly an annoyance reserved for packagers to deal with. Dynamically linked executables can be patched in a fairly universal fashion to work without FHS, so that’s the go-to approach. If the executable is statically linked, the package may have to ship a source patch instead. If the executable is statically linked & close-source, the packagers are forced to resort to simulating an FHS environment via chroot.