You may say Linux is used by a lot of sysadmins, but most Linux servers are not properly maintained, so expect the "sysadmin" to only be one in title.
I never said any such thing. I said that Linux was the dominant computing platform these days. How it got there can be debated, but for backend infrastructure it is judged on its merits because it can do the job. As for but most Linux servers are not properly maintained, I don't have any such knowledge, nor do I think it's relevant to anything we're talking about here.
the Linux kernel is far superior to the dev community that surrounds it. Linus has his hands full keeping people from ruining it.
I don't know where you're getting this information. The vast majority of active Linux kernel devs (or at least the majority of commits) are on payroll at places like Intel and RedHat. There are multiple levels of maintainers that are responsible for specific areas of Linux. Bad patches don't usually get through. The hierarchy is in place such that if Linus disappeared tomorrow, everything would carry on without him.