Someone might correct me if I’m wrong but it’s that, plus extra tooling to redirect the stuff that needs to be writable, plus more extra tooling to allow you to temporarily unlock the read-only parts in order to do system updates, plus a system updater that puts the whole system more-or-less under version control.
Yes, kind of.
Someone might correct me if I’m wrong but it’s that, plus extra tooling to redirect the stuff that needs to be writable, plus more extra tooling to allow you to temporarily unlock the read-only parts in order to do system updates, plus a system updater that puts the whole system more-or-less under version control.