Added visual interest. People tend to want variety and colour and movement offered by different views can provide that. This is the obvious reason it’s being used.
Ability to edit without it being obvious. Often a presenter will require multiple takes to “get it right”. If you edit in the take, the picture “jumps” because humans move around. If you have multiple cameras you can edit and switch cameras without it looking like an edit. If you then also look at a different camera when you make a mistake, you can keep recording and fix it when you edit it together.