> Attention spans on mobile are atrocious (notably, the fulcrum is screen size having a neurological impact on ability to pay attention - this is a biological fact) – very little real reading takes place.

If you have any further reading on this please share.

n=1 with exception for scientific papers I do essentially all my reading on my phone and I do not experience any attention difference. I also have my phone on perpetual DnD so notifications and other distractions are not a thing.