Software. What's a computer without software other than an over glorified calculator.
That was my first experience with Linux back in the early 2010's and pretty much up to recently. However with changes to my workflow and Steam improving and sharing the improvements with Wine. My software library went from web browsing and office software t
99% of games, and all of my business software.
The UX experience needs some work under the hood. There is still a nasty tendency to over rely on the terminal to fix basic problems. (IBT=off for VM to work).
But its close enough that I can almost recommend it to my grandparents.... Almost.