Agreed. Windows 10/11 can run just fine on 4GB of RAM. You just can't run anything inside of Windows 10/11 with 4GB of RAM.

The last version of Windows that felt like 4GB of RAM was performant for me with applications was Windows XP. Not that every computer running the 32-bit edition of Windows XP could even see/utilize a full 4GB of RAM properly, but at least it was fast.