You don’t even know what a kernel is, and I doubt you’ve seen any modern desktop environments. There’s nothing wrong with linux, there’s not development that needs to be done to fix it, the vast majority of issues I experienced were just a few windows apps or games not having good linux support. This isn’t a fault of linux, it’s the fault of the developers behind those apps and games. Also when I want to install something on Linux, I simply open discover and search for it then install. Anything not easily found in discover is most likely for more tech savvy power users anyways