If digital user interfaces and navigational difficulties inhibited reading comprehension in the modern age, what did similar interfaces do to early reading practices?

What methods do we have to tease out data of these sorts of early practices?

What about changes in modes of reading (reading out loud vs. reading quietly)?

I'm reminded of this as a hyperbolic answer, but still the root question may be an apt one:

https://www.youtube.com/watch?v=pQHX-SjgQvQ