I repeat, "why is that the fault of Linux"?
Oh I get it....you want to be a pedant.
If you want any discussion about Linux limited to the kernel, then say so. But a kernel is not an operating system.
If its not some amateurish log in screen (on its most popular distro BTW) its something else in the operating system that is a joke.
Or do you think users should now de-install the default log-in manager, install something that someone may have rolled in the bedroom and risks breaking the system? Because you know "Linux isn't Linux isn't Linux and can be any flavour you want" TM?
Another classic example of Linux wasting time people's time trying to get it to do RST* (Really Simple Things). Like a login manager that actually makes sense by default..