I already went through 3 distros - Kurumin, Suse and Ubuntu, and the only reason I still have a Windows partition is to play some games that I couldn't (or didn't bother to) make work under Linux. I can tell you, the bar is very high to start. Ubuntu made it lower (and lower at each version) but it is still too high for mainstream.
And it need not be. The whole problem is always understanding the differences. If I pick that distro or that distro, what changes? What do I lose? What do I earn? Unable to find answers, one doesn't choose lest one chooses poorly.
Lisp implementations are the same.
Thank you for your answers. Allow me to add just two more. If one says Arc is not CL, but a whole new kind of Lisp that tries to solve some of those problems, what exactly are the differences? What does Arc advance as a Lisp standard?