For everyday user (browser, light office, photo management, tv/movie streaming) it is already as viable as windows as a daily driver.
Once it is installed and up and running. But then most windows users haven’t installed windows themselves so that is almost a moot point. It is first when you get into “specialty” software linux viability drops.
Larger and/or gamey games 1€/h. Here I put games such as the Tomb Raiders, cRPGs etc.
Narrative experiences 5€/h. Stray Gods and other high quality intense experiences. Often short and with limited replayability. Like seeing a movie a second time.