A daily experience is getting Webex calls while in a Microsoft Teams meeting. The presence status in the Webex app stays green. Many people then prefer to take Teams Calling alone without having the problem.
The presence status between Microsoft Teams and Webex app should be synchronized. This would also fix the overlap when both apps are installed and need to sync with Outlook. Many vendors are building this feature into their apps right now.
This feature is on the roadmap for the 2nd half of 2022.