Many companies issue laptops. But even some of them have shared computers in meeting rooms or connected to equipment. Single user laptops are rare in medical facilities, banks, call centers, and many other places in my experience. Many shared desktops could be replaced by virtual desktop infrastructure theoretically. But this would cost more in many cases.

My network configuration is in /etc. Flatpak applications can be installed for system or user. And users able to install applications for themselves does not make the multi user model broken.