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.
In my opinion, if there is a big game without commentators, it will be difficult to find the weaknesses and advantages of a game, such as sports games really need commentators to improve the quality of the players.
Yep! in esports not all the players has been given a spotlight, I mean not all of them can be seen clearly because they are doing the game in mobile or in pc while other sports athletes can be seen directly not in the big screen. The purpose of some commentators are to become some analyst as well , they know the game and they can help people to see the reason why they did this , buy this item etc.