There are plenty of ways to configure Linux to circumvent sudo. I’ve even seen people who log in as root by default. I do not, however, advise anyone to do that even if it’s just, as you put it, a Molly Guard. It has prevented me personally from doing catastrophic things to my system on a number of occasions.
totally this!!! Most users just need a browser and an email client at best. They couldn’t care less about the OS that’s sitting on top of. If they could go to a store and see a $1000 laptop with Windows and $800 laptop with Linux being sold side by side, majority would pick the cheaper one if they could still get online with it.