It will be not only a break of consistency in terms of UI, it will be a break of focus during the user journey.
This feature, as I said, is part of many user tasks, one of the most common user case is:
- you fill in the form for a order (ex. trading)
- you receive from the system a notification, on your devices, when the order is processed
- you open the web app to verify the full content of the message
- you want to create a new order and/or to communicate with your asset manager
my point is that if why apply your suggestion to the communication overview we have to be consistent with all the other screens. Is it more clear now?
BTW this post just appeared on my LinkedIn stream, it perfectly match with my thoughts about your suggestion