If I have to listen to someone with zero of what people would call "external distractions" I'm barely going to remember any of it. But if I can poke on my phone while I'm listening, maybe look up some information relevant to the topic, then I'm much more engaged and retain far more of what's being said.
There's a difference between "eyes glued to phone" and "eyes looking at phone occasionally and then returning to the room". Too often, people see the latter, and it's like looking at a second hand on a clock. They take the initial glance, it looks longer than it really is, and so "eyes glued to phone" is their takeaway.
> I had a manager once who, if she would spot someone on their phone in a meeting, would put them on the spot and ask them a question relevant to what the team was just discussing. Some people would call that a "dick move" but I'm actually supportive of it. If you're supposed to be paying attention, get off your phone.
That manager would be flabbergasted when I answer the question. Unfortunately her takeaway would probably be "he could answer that while still not paying full attention? how can I make him pay full attention!" despite the fact that what she would call "full attention" would make my brain more likely to drift.
