Here's the more important thing I've learned: they shouldn't.
When I went through the education program at my college, I wasn't interested in learning how to 'create and share a Google Doc' or how to 'flip my classroom'. I wanted to teach English. I wanted to teach kids how to actively read, how to engage in thoughtful discussion, how to communicate effectively, and how to be lifelong learners. I wanted to teach kids to be collaborative, persistent, and reflective. I didn't want to spend time sifting through iPad apps, learning about different content management systems, or sitting through workshops about QR codes. I wanted to teach.