That’s not how things operate here. Note how your complaint isn’t in the guidelines. https://news.ycombinator.com/newsguidelines.html

The site encourages people to delete unproductive comments that haven’t been responding to as it improves the reading experiences for 3rd parties. Which is one of the reasons there’s a big old delete button and you can edit posts for a full hour.

Adding “Edit:” is important for clarity when a post has been responded to, without that it’s just clutter.