Re: "there are much more suitable options for that"
"I want an OS that is solid, efficient, and works well. Those goals seem to preclude being suitable as a mass market consumer OS."
It is actually more important for a consumer OS to be solid and work well. That is because consumers know little about the running of a computer system, so the system must do everything to protect the consumer (against themselves and others).
The monolithic kernel architecture of Linux is against that. Linux is good at being run on servers where it is run and maintained by professionals who rarely update anything before a lot of testing. Linux is good in that environment, but those who run those environments should not say that Linux is good for all - it is not.