There was a brief revival during the era of NFS mounting /usr, back in the era when /usr/doc could be a significant fraction of a filesystem and shipping whatev

There was a brief revival during the era of NFS mounting /usr, back in the era when /usr/doc could be a significant fraction of a filesystem and shipping whatever-doc packages made sense because it takes a long time to download at 14.4. I actually had deployed production systems with /usr/doc and some other stuff NFS mounted. It doesn't make much sense anymore but before the turn of the century a meg of doc files might cost you a buck per machine, which might add up to a lot of money given a lot of machines and a lot of software... And usually you don't need /usr/doc but when you do need it you REALLY need it and don't mind if its a little slower to access via NFS than on a local drive. In the same old days, some brave people exported /usr/src. Oh and X window fonts too.