A lot of people have already talked about the onboarding/installation experience, so I’ll just chime in and say a lot of new users are unfamiliar with using a terminal for commands and instead favour a GUI experience solely for their tasks. Most modern and commercially appealing distros are moving in this direction (ie applications running the same terminal commands in the background with an easy to understand UI at the front) but I’d still say the community’s insistence on terminal over all other forms of executing a command may be a turn off for the layman trying it for the first time after Windows and MacOS.
Almost makes me think it would be more ideal to reduce the stigma associated with executing commands in the terminal and find some way to get people more comfortable with using it, both via Linux and also CMD for Windows as well.