What blew my mind and convinced me to only use immutable distros is the immutability of it. For instance I could create my own login screen for an web service

What blew my mind and convinced me to only use immutable distros is the immutability of it. For instance I could create my own login screen for an web service without having to worry about the package manager overriding my code, because I inject it into the container, which is already updated. I can also forcefully reroute much easier ports or network connections the way I want it.