Here's a fun consequence of the Lock Taskbar feature disappearing:
Under Windows 10, with two screens, I've had the problem for years that the Taskbar on screen 2 spontaneously grows to 2 rows every once in a while. (The Taskbar on the main screen stays 1 row, as I want it.) The solution to this behavior has always been: unlock the Taskbar, resize the Taskbar on screen 2 to one row, lock the Taskbar).
Under Windows 11, the problem still exists. On my 2nd screen, the Taskbar has spontaneously resized to 2 rows. But now that the Lock Taskbar option has been removed, I have no way to correct this. So now I'm stuck with a double-sized Taskbar on screen 2.
Trying Explorer Patcher.