The truth is that the process of hiding comments is slightly easier and faster than deleting them. Because once you are in this role, you just have to uncheck or disable Comments option, which will remove the check mark and, therefore, the Comments sidebar will be hidden, not being visible.
Remember that this option does not remove comments from the document, it only hides them to make editing or reading the text easier (and less cumbersome). In any case, if you want to make them visible again, you will only have to go back to the Review tab, click on Show marked, and mark or enable the Comments option. Again, the Comments sidebar will appear.