I was a teacher until recently, am now retired.
But when I taught I used (at the same time) textbooks and a whiteboard, and a smartboard along with individual blackboard slates. I had a game we could only play on an overhead projector, and though the school didn't provide a laptop or tablet for every student (most had one or the other or both at home), the school had two 'regular computer' labs, and two which which were 'laptop' labs. I gave ordinary paper quizzes and tests - as well as those which had to be taken online.
In science we did virtual labs; we also did labs where we sat on the floor using cars with roller skate wheels. We blew up Hydrogen gas, then watched videos showing scientists doing the same thing on Youtube. We drew atoms on the (ordinary) white board in outrageous colors, then compared them to scientific illustrations in a text, and on the internet (via the smartboard.)
Point is, what works, works. We've always been a culture where technologies overlap, the new and the old. Some of the old stuff fades away; the new replaces it. But sometimes the new ain't so hot, so we go back to the old. (In my house I have modern furniture and a few antique pieces. What works, works.)
Language is the same way. Some of the old stuff sticks around; some of the new is new for a year, then forgotten. But who says, "She's the cat's pajamas," anymore? Or, "Wow, that's swell." If you're writing takes place in the 1940's, both expressions might sound natural. (Or if your great-grandmother is commenting on how great you look.)
Here's an expression which has been around a long time, but sounds fairly modern, "Okay."
And as someone wrote in this thread, you shouldn't be worried about 'dating' your story/novel. The moment you write it, it's dated already. If it needs to be set in a certain era, try to be true to that era, but if it's set in the 'present,' the present becomes the past before you know it.
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