It would be beneficial if users (process owners/experts/approvers) had a way to approve or deny processes while actually viewing the process. The button would be beside the feedback button up to serve as a reminder to users viewing the process that they need to approve or decline. This way they can be reviewing the process and quickly approve/deny/add feedback for corrections as needed from one location. This would also be beneficial when you're not able to access the 'my changes' tab because this would be one way to prevent disruption of the approval process.