You forget there though, that a lot of the RAM, that Windows (and most modern operating systems) uses, while idling, is a cache of programs you’re likely to open and that gets cleared, if you open something else. That has been a thing since Vista and was btw one of the reasons why Vista was criticized for high memory useage. Windows 11 is very useable with 4GB of RAM, if you’re not planning to do something bigger than browsing the web or editing a word document.