While we’ll continue to use your feedback to guide the future of features like this, currently on Windows 11, you can right-click the Start menu button to quickly open the Task Manager. Thank you so much for giving us your feedback.

Microsoft responded to the feedback and confirmed that this is the new behaviour in Windows 11:

This shortcut not only make absolute sense but removing it creates massive corporate cost. There is a massive decades-old legacy of internal corporate documentation that leverages the simple right-click on the taskbar to access the task manager to troubleshoot issues. As mentioned at the outset, Microsoft is removing the context menu (right-click menu) for the taskbar and users are clearly not happy.