On Thu, 22 Nov 2018 10:10:20 +0100
Didier Kryn <kryn@???> wrote:
But
> the part of the OS (which is managed by dpkg) better stays on one
> single partition.

IME, absolutely nothing in real life works that way.
Do you dump all your clothes into one big bin or store them by say
type?
Do you store all your house fitments in one big bin, or store in many
"partitions". I find it so annoying having to retrieve clean cups from
under a pile of screws, bolts, light globes, etc.

Sub-division of stuff is logical and leads to efficency and the same
applies to computer OSs.