Login and sound theme

Hi everyone
why there is no login sound like in mint or ubuntu ?
And why can’t i change the sound theme from settings or gnome tweaks settings ?

You can make a .desktop file that calls libcanberra to play a sound then assign it to autostart on login. This works with most DEs. Look at this example with Mate but in Gnome it would be quite similaro how-to-activate-ubuntu-login-sound