Please stop this. "Casual user", "average user", "normal user", it's all just so much bullshit people tell themselves to feel superior. Stop creating this strawman and using it as an excuse for why things have to keep sucking!

ChromeOS and Android adoption prove otherwise.

The large majority of their users don't even know what kernel is running the runtimes of their apps.

One of the reasons of netbooks failure, besides the cheap Windows XP licenses move from MS, was that each netbook Linux was its own little silo.