Practically in this century if I was starting a new OS I would set it up like so:
/bin for all system binaries. Any binary from a package installed by the OS package manager lived here.
/lib same but for shared libraries
/var for variable data. This is where you would put things like your Postgres data files.
/tmp for temporary files.
/home as usual.
/dev as usual.
/boot as usual
/etc as usual
/usr would be what /usr/local is on most systems. So /usr/bin is binaries not installed by the OS package manager. /usr/etc is where you put config files for packages not installed by the package manager and so on.
Get rid of /usr/local and /sbin.
/media replaces /mnt entirely (or vice versa).
Ditch /opt and /srv
Add /sub for subsystems: container overlays should live here. This would allow the root user (or a docker group, etc.) to view the container file system, chroot into it, or run a container on it.
Then again, nobody gave me a PDP-11 to decide so my vote doesn’t count :)
If a system is intended to serve data on a network (file shares, databases, websites, remote backups, etc), /srv is where the requisite data for those things should live. I think that's a good idea.
> This directory contains subdirectories which are used as mount points for removable media such as floppy disks, cdroms and zip disks. https://specifications.freedesktop.org/fhs/latest/media.html
/var is used for websites and databases, but defaults for most packages don't use /srv by default. (I have the feeling that /srv is relatively new.)