For the current behaviour of JIRA Service Desk, before Agent could comment on a ticket, they could choose to whom the comment goes to. In the process "Respond to Customer" and "Internal Comment" is sharing the Comment Text Field in which clicking to another Tab will retain the comment inside.

Hence, it would be useful for JIRA Service Desk comment to have an Independent Comment Field for "Respond to Customer" and "Internal Comment" each. This will make making a comment to the Customer and Internally simultaneously possible, and it might able to prevent mis-commenting to the wrong party like accidentally clicking on comment button while the tab still selecting "Respond to Customer", where it meant for "Internal Users".

With this feature, it could make it possible to comment simultaneoulsy to Customer and Internal User since they have independent comment between tabs.