Zoom won't really help you with the above situation which is mainly users having their microphones disabled etc.

We're building a virtual classroom solution and we now always force every user to go through a wizard which checks their audio and video, clearly marks when there is no sound being received and connects them to a support person to help them resolve their AV issues before they can join the meeting.

It's a little annoying for the person who wants to join, but the experience for the people already in the meeting/classroom is much better.