#1 is just not being the default for 99% of devices. If someone gets a new computer, why would they go through the effort of installing a new os when the one it comes with works fine? Hell, I bet at least 50% of people in the market for a pc don't even know what an OS is.

• Self updating without user interaction per default.
• Better support of codecs and drivers.

You have to use the terminal

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1. Installation process of Linux is complicated to an average Joe (Bootable USB/ISO file/Boot priority/format <- what are these scary terms?)
2. Lack of availability of pre-installed Linux PCs at physical shops
3. Lack of availability of industry-standard software
4. Confusion for an average Joe due to excess choice of distros/application packaging format. Average people don't want choices, they want to be guided.
5. (Minor point) Most available guides for doing something heavily requires terminal usage which can be daunting to new users

1. All of the basics should just work well out of the box with minimal tweaking. Yes even NVIDIA stuff.
2. The software center needs a massive overhaul. It feels like an afterthought by people who would rather use a command line.

Speaking from experience, from a long time ago, and from the people/family I've installed it for on older machines: It's different. That's 90% of it.

The people that had little to no windows/PC experience actually took to Linux a lot easier not having to relearn/change habits from windows.