I know how my car works, I can even do some basic maintenance on it. But if there's something wrong with it I take it to dealership and have a professional take a look.
The "casual" user is non-technical, I dare say the majority of computer users have absolutely no idea how a computer works. It's all some sort of dark magic to them. I find it rather interesting open source projects need to be made so the casual user can install and configure it. What percentage of computer users actually install and configure an operating system by themselves? It's not going to be the "casual" user, it'll be the computer enthousiast, someone who knows a bit about computers. The casual user is going to buy something in the shop, and if there's something wrong with it they'll take it back to the shop or hire someone to fix their problem.
The "casual" user is non-technical, I dare say the majority of computer users have absolutely no idea how a computer works. It's all some sort of dark magic to them. I find it rather interesting open source projects need to be made so the casual user can install and configure it. What percentage of computer users actually install and configure an operating system by themselves? It's not going to be the "casual" user, it'll be the computer enthousiast, someone who knows a bit about computers. The casual user is going to buy something in the shop, and if there's something wrong with it they'll take it back to the shop or hire someone to fix their problem.