In the backstage videos of music videos, you can see that camera operators are filming with small video cameras.
In the backstage scenes of TV shows, you can see that cameramen are filming with large cameras that they carry on their shoulder (or mounted on a tripod).
Comparing the quality of music videos and recordings of various shows posted on YouTube by TV channels, I do not find any difference.
It seems that small video cameras shoot just as well as large video cameras.
What is the difference?
Judging by the YouTube quality isn’t a good way because they’re probably all encoded at the same rate.
Like most things technical, you tend to compromise quality for mobility
Here’s a video on TV production cameras https://youtube.com/watch?v=rYafZeiIFwA