Additionally, every time you make a comment when reporting a post, it is saved so all you have to do to get an option is to enter first letter of your report in order to get all of them. So for example, if you reported post by writing "Low value post", next time all you have to do is enter "l" in the comment section and it will offer you that, and all other comments that start with "L". It makes a difference when you are mass reporting, trust me.
This only happens if you've got the option for forms, and fields to be saved. I'm personally disabled that; however I do believe most browsers ship with this by default, and it might not be changeable in the settings, but rather through editing the JSON policies of that browser. I'm only familiar with Firefox, so I don't know the process of other browsers. However, I've heavily modified the policies of Firefox, and that's one of the options I did disable. Firefox might have this option accessible in the settings though, if I remember correctly so it's quite possible some users have disabled this.