Earlier quoted context omitted.
In other wording, if someone is speaking about a subject I'm not entirely familiar with, I'd likely be googling different details to get a more real picture than the one presented by the person proposing changes. Incentives and all that. An issue with political discourse in parliaments is that it's a meeting with a lot of important people so you can't really ask for clarifications again and again as you would in a 5…
If you're constantly looking up things on your phone about what a speaker just said, you'll miss the thing being said right now. Humans cannot multitask. Anyone that says they can are lying or are misguided at best. So instead of missing one thing, you've put yourself in a position to miss even more rather than looking up something afterwards.
I don't believe this to be axiomatically true. I don't believe it's an intrinsic ability, but I believe it's very possible for humans to task-switch at a level that appears like multitasking (and when you think about it, the only multitasking modern computers do is the threading that multiple CPU cores enable, when it comes to a single core there is only one task running at a time, ever).
In certain situations, I've found my brain able to do almost fractal searches through a target space. Or at least to simultaneously search for the answer to more than one question (take the game Hangman and its variants, when looking at a partial word my brain is certainly not searching for a single letter at a time).