I'm not sure if the latest version for Windows 11, are still updating system files, or customization methods have changed.
Windowblinds does not alter or replace any system files in any edition of Windows.
Instabillity occurs when the user is deploying non-Stardock GUI altering software (with the exception of Winstep Extreme and Nexus Extreme) together with Stardock software. Instability also occurs when the user deploys dev/insider builds of W11, as Stardock cannot possibly alter its software for so many/frequent builds.