I totally understand the art board debate, thing to remember is that not everyone is in paper publishing. As a web developer, I find I use art boards a lot while doing UI mockups and wire framing. I like to view the art boards side by side vs. in layers so I can quickly see the exportable sprite objects that I will save out to animate with css or scripting later. I work at an agency that also owns the 6th largest large format digital printing company in the US (with a mixed bag of designers and developers).. and I do notice that the publishing type designers don't really uses art boards as they live in a indesign world and only use vector design for logos and single placed elements, but the sign/vinyl designers and the web developers use them all the time. The sign guys will layout 100 different - 3" x 12" signs or something that all look the same but might have a text change on all of them and keep master file and then export them all to flexi sign or onyx for large format printing.. and the web developers can design a lot of UI or sprite items and export them as pngs or svg files and keep them all in one mock up file. I think there is a valid reason to use art boards. I'd be willing to submit a bunch of our large format set up files and web design files as case studies for the affinity team to look at.