In Windows there are tools or 3rd party softwares available to customize literally almost anything. There's plenty on Linux that I couldn't say the same for. Granted I may not know where to look in some cases and may have missed it, or it may simply be a result of my lack of experience with Linux in general. But the point is that a new user's first impressions matter, and if someone who isn't comfortable doing commands and using non-GUI tools is forced to use them all the time, their patience may run thin faster than others. I believe people should want to learn and they should do the research. But realistically, if the goal is to get as many users to adopt Linux as possible, this is a barrier to entry.