There is some overlap though. I tend to find
(certainly on en-wikip)
there are some articles which could be explained in layman's terms,
particularly in maths and physics, that don't bother and just launch
into a forest of LaTeX.
>
I agree that every article ideally should have a "Subject in a nutshell"
explanation in the introduction (which again brings us to the problem of
the participation of academics). But it does not mean this explanation can
be always made available for 10-years olds.
Cheers
Yaroslav