The discussion ranged widely, and the issue I think is FIDELITY. We talk a lot about fidelity of mockups in ID, and wireframes are prototypes. And that’s why paper sketching seems to be a good starting point for me and a lot of other people. I get that there’s the issue of workflow – if it’s going to be digital, start digital. but there’s also the issue of Energy of Activation – for me and a lot of others, picking up a pen is a lot faster (and portable) than sitting down on a computer. Low Fidelity, but high speed and low activation energy.