Well, what do you expect me to do? Use chalk to theoretically discuss my Physics experiments on a slate?
Granted, I am doing that from time to time but I'm also a bit annoyed when my pupils still have to use pencil and paper to write down the data from experiments they're doing. That may be worthwhile the first two or three times to show them the ropes, but after that it gets old fast.
Or take chemistry classes - so, first the pupils have to draw the molecular structures on their paper and then draw it again on the whiteboard. That takes time which could be spent on actually discussing the problem.
There are countless of other examples where technology can speed up several processes quite a bit, particularly when it comes to sharing results.