> Nowadays smartphones do credible document scanning for most consumer use cases. iPhones had this built in before COVID at the latest.

Now do 40 pages, front-and-back, with your smartphone.

That's not "most consumer use cases".

I have not once in my entire life had to scan 40 pages at once. I bet I've never done more than 15 at once.

For the once in a blue moon that I need to scan 40 double-sided pages I'd just go to my local print shop.