> I'd also guess that at least some people use the computer to look up additional information instead of stopping the class and asking, which helps everyone involved.
Are you sure about that? Intuitively, wouldn't it be the opposite? Asking questions results in the teacher giving an answer that can benefit the whole class, whereas if you just look something up yourself you're the only one who benefits from that additional piece of information.
While I won't deny that it's possible the question might help multiple people, it's more likely that if it's simple enough to look up online, it's better for everyone to do their own research.
Lectures still serve to help for more difficult questions, and the time is better spent on them instead.
Are you sure about that? Intuitively, wouldn't it be the opposite? Asking questions results in the teacher giving an answer that can benefit the whole class, whereas if you just look something up yourself you're the only one who benefits from that additional piece of information.