I am and was reading https://lwn.net/Articles/773342/ where the current move of migrating whole lot of filesystem from /usr/$something to simply /usr . Some of the comments again and again comment on the fact that /usr/bin was created because /bin became full but it doesn't go in any details as to why /bin used to become full ? Where there any real or artificial limits to /bin then ? Also I'm not able to co-relate or find out when these events happened in some sort of chronological order. The only assumption I can make is we had too small hard disks or tapes (which were and are still expensive to run and maintain) . If anybody can throw light on this obscure history .
In today's world, I usually recommend newbies something like /boot - say something like 200 mbish, / for 15-20% of the hdd and the rest for /home with swap at around 1:1 . Having this new structure should, at least in theory simplify maintainance quite a bit although have no clue from a security viewpoint.
Anyways, if somebody can share some of the history it might give people like me a bit more how things are, the way they are.