What happens then is that the new Linux user soon needs a newer version of some package and they have to add a third party repo to their stable system and after

What happens then is that the new Linux user soon needs a newer version of some package and they have to add a third party repo to their stable system and after having done this a few times, soon an update from one of them will cause the install to be unbootable. I've had a way better experience with desktop Linux when using a managed rolling release like Manjaro.