As noted, a comment counter is available at the feature level. Additional, when commenting on requirements and features, these comments are automatically emailed to you when subscribing to the conversation or when you are a watcher of the feature -- allowing you to be notified in real time.
The real estate in the requirements area is very limited, and because of this, we look to provide only the most important information so as to help the area be legible. At this time, because of current capabilities and current priorities, we do not have plans to make changes in this area. We hope you can understand.