Pooping is interesting. Having a toddler reminded me how pooping is this uniquely vulnerable, sensitive time for humans. I think a lot of us use books/phones/etc to distract ourselves from a sensorily intense activity. I'm not saying that's a good or bad thing, just noting it.
I will say that playing my Nintendo DS on the toilet many years ago gave me hemorrhoids that still persist decades later. Don't camp on the toilet.