Most millenials I deal with don't know how anything works. They know apps and swiping screens. They are computer competent, knowing how to use them. Like knowing how to drive a car doesn't mean you are a mechanic. They frequently know how do basic fixes like rebooting or reinstalling but less frequently have any true troubleshooting understanding. I don't claim all millenials are like that, but broad stroke its not uncommon. I'd never say the generation as a whole is THE technical one though. I know more Gen Z that are technical by far, but that seems more matching Gen X to me. They either know technology or don't. Nothing in between.