LCA: Disintermediating distributions

> While Windows is the only major platform which doesn't have a POSIX 
> shell, it is on the other hand the platform which has like 80 or 90% 
> market share. So one could also say "only 10 to 20% of installed systems 
> have a POSIX shell".

On the third hand, there is a POSIX shell, and build tools based on it, available for
approximately 100% of these.  They aren't necessarily installed by default (many Linux systems
don't have a C compiler by default either these days), but developers are more than capable of
installing a software package for this purpose.