Because until you spend many hours getting used to it, it’s annoying as hell. I’m a longtime bash user, but if I have to do anything in PowerShell, it sucks. Bash is even less friendly to novice/casual users due to tools like awk and sed being totally obtuse. When you’re unfamiliar with the workflow, not being to see everything you’re able to do at a glance is pretty frustrating.
Are there any companies making discrete laptop graphics that don’t have proprietary drivers? I don’t think I’ve ever seen an AMD powered laptop unless it used an APU. I shudder to think of what proprietary Linux drivers from a company less resourced than Nvidia are like.