You can see the stack trace on stock Android when you click "Report", then "Show system info", then scroll down to "Stack trace" (didn't check exact wording).

You can see the stack trace on stock Android when you click "Report", then "Show system info", then scroll down to "Stack trace" (didn't check exact wording). The Report button is still there - maybe it is not shown if there is no one to report to? For apps on Google Play, the user reports can be seen in Google Play Developer Console.