That’s not a very strong argument.

When you started a job, did you understand it all? When you first started using Windows, Android or iOS, did you understand it all? No you didn’t. As with anything you’ve never used or done before, you won’t understand the ins and outs or know what to do in many situations. You learn about them. I certainly didn’t know much about Linux when I started using it. In an IT environment, I had to learn. I work with Windows and Linux on a daily basis. Both have their strengths and weaknesses. I use both on my personal devices.