Hmm, I guess it depends on the task and workflow. I find this easy if I have to send out the document via Gmail, WhatsApp etc.
After I open up the PDF document (which I have to, anyway), the remaining steps happen on my phone. I find picking the right scan filter convenient on the phone (relative to point-and-click on a laptop) - I guess this talks more to the UI of the scanner apps. Then "sharing" the final document via the right app (mail etc) right from the interface of the scanner app is also fast.
Overall, I have noticed this takes me 5-15s to "scan" and send, per page.
Overall, I have noticed this takes me 5-15s to "scan" and send, per page.