Various notes on /usr unification

why would there be enough benefit in a more human readable fstab (which is mostly not manipulated by humans anyway) that would make it worth breaking all existing tools that understand the current format?

while I would agree that there are nicer ways to configure what's managed by fstab, there is a large pool of tools and training that know the existing format, what may have been a great change to make 30 years ago needs much more justification now.