>make a computer that's safe for grandma to use

People also forget that it makes it safe for people who aren't grandmas. The reason why you think it's just grandmas is because, for you to get a virus or your computer hacked now, it requires so many user gaffes for something like that to happen. In addition, it almost always involves typing in or telling someone your password when you shouldn’t. In the early 2000s, I still remember there was some ad affiliate for the cyanide and happiness webcomic website that, if you let it's ad load, instantly infected your computer with adware just from visiting the site. That’s unheard of now because of increasingly protective/restrictive policies set by technology companies. It’s one of those situations where if a system is working correctly, you won’t even know it’s working at all.