Even if the match or the event is exciting I could not watch it without these commentators they add value excitement and information to the matches they are the voice of the match or the events, even if you don't know much about the sports that you're watching you'll get insight and information by just listening to these commentators.
Yes, they add value and quality of a specific sports that they are broadcasting rather than on watching the game fully without having any noise out of these commentators.
So i would say that its really that important to have one rather than have nothing at all.I dont know on others on why they do agree on having none
or saying or telling that they arent really seeing this to be that relevant or needed.