I tried that path back then but it still didn't work for me - no program I tried to put there incl Windows ones was able to launch at the login. I had just entries in the task manager's startup page. Maybe something changed in 11 - dunno

I can guarantee you that the startup folder still works fine, but in some cases you must create the folder.

Microsoft does not screw around with backwards compatibility. There are multiple ways to start applications on launch now, including the user or public user startup folder, registry entries, and via scheduled tasks.