

Dude, this is like asking “Which car manufacturer ships new cars with mirros folded?” Every driver ought to know that it’s only a matter of pressing the button and they fold. Disqualifying all those good manufacturers because they don’t fold their mirrors before shipping sounds stupid.
Same here on this topic, it’s only a matter of running one command to create the user. Options include writing the instructions down on a piece of paper before giving the computer away, or close the little gap between post-installation and setting up users by yourself.
Krita does not need a tutorial before using. If you don’t know about a specific subject about Krita, e.g. reference image, just watch a random video on YouTube.
Also check out their official documentation. https://docs.krita.org/en/user_manual.html
And this community. https://krita-artists.org/
There are also training materials (art, not software) you can buy while supporting the project. https://krita.org/en/shop/