We caucus here in Nevada, and I really, really dislike it.
As the video points out, many people don't have the time to take off work and attend a caucus for an hour or two at a specific time.
Primaries, which are like a regular election, are held all day - people can come, vote and leave in the morning, afternoon or night. Whatever time suits their life and schedule.
Primaries definitely include more voters, and that should be the point. I'm told Nevada does the caucus thing because primaries cost more. Boo.