I think this here is probably one of the larger reasons. A large portion of users barely know the difference between a browser and a search engine, let alone the operating system they are using, and nor do they care. People just use whatever their computer comes with out of the box. Most people probably couldn't tell you the difference between Windows 11 and a Linux distro customized to look exactly the same.
Terminal inputs seems like coding. Back in the day you can mess with everything by coding. Having to spend time on forums and searching Google to fix problems that are Terminal inputs only is not something people want to do and what people are passionate about a thing or it is their hobby do.
Most people use what is in front of them, works, and what they are use too. I don't have time to fix the wifi issue on my 10 year old linux laptop I just plugged it in. Other option is to reinstall windows every 6 months