It's pretty common where I work to bring laptops to meetings. If the meeting is engaging they close, and sometimes in deep meetings they are asked to be closed. In other meetings it helps to have many hands on keyboards updating the sprint board in jira and entering new tasks, or the meeting is rolling attention and people are there and do work until they are needed by the meeting. This is often what happens in all hands on deck situations or launches.

People who are holding meetings where I work realize when they're wasting time and generally dismiss people if they're not needed and everyone is generally free to just leave if the meeting isn't of use to them.