Stardock is well aware of Explorer Patcher. It relies on old Windows 10 code which is still resides in Windows 11, however, this code will be deprecated in Windows 11 24H2, and EP will no longer work. Start11 allows putting the taskbar at the top, but not the right or left.

My opinion is that MS is planning to shake up the way we access data on our computers in the next major upgrade (Windows 12). There have been images on various news sites where apps are on am Apple like dock, and the clock, system tray, search, etc., are at the top of the screen.

Stardock actually created their own taskbar (enhanced taskbar) to replace the default Windows 11 taskbar, and made the decision not to include left or right orientation. The implementation of left/right taskbar placement would require a tremendous amount of time and coding for small niche group who would use it, especially with the writing on the wall of an entirely new implementation in Windows 12.