Milestone can be composed of many test plans. Similarly, a test plan can be composed of many test suites. It is very helpful to view the pie chart at both the milestone and testplan level.
As a manager, when I see that there are 10 blockers in a particular milestone, I would like to view them as quickly as possible so that I can work on unblocking these issues.
It would make sense to be able to click on this blocked piece in the pie chart and TestRail should show me all the blocked tests. Currently, the 10 blockers in a milestone are spread across various test plans and I have to go to each test plan and then go to some testsuite within that testplan to finally view the blocked testcase.
Would be great if this can be part of the next release.