I think the way that apple in particular, but a lot of modern pieces of technology in general, tell end users "if you try to fix this yourself, you'll void the warranty" has scared a lot of people off from trying to learn how to troubleshoot or fix things themselves.
In my professional experience, I often find that people don't have the time or incentives to play around with settings any more. Whenever possible, I like to play around with all the possible settings in a new tool, application, etc. just to see what happens, and I think the freedom to play around with settings is linked to the confidence to try troubleshooting.