Say, of all the different skin choices, there is no choice for "none"
as a skin. Why: as some users, e.g., visually disabled users or batch
users like me, would be content with just the page and not the nine
other or so accompanying files involved, css, javascript, etc.

OK, one could say that one should adjust ones browser to not ask for
all those extra pages then. Correct.

But still, for completeness, do offer a choice for no skin at all.

Hmmm, as to what "no skin" is to imply, I'm not exactly sure, but
probably causing only one page with no helper pages needed, and the
smallest number of bits sent down the line to give a basic rendering
job. hmmm, but what about images...

P.S., the user has sent a request with his user agent clearly not IE,
but still the HTML is full of "if lt IE 5.5000" etc. wasting
bandwidth. OK, maybe you are doing this so the page can be cached
better for other users.

P.S., I discovered if one uses an unknown useskin=, one sees a hidden
"Bug reports" older link:
$ w3m -dump 'http://localhost/mediawiki/index.php?uselang=en&useskin=x'|tail -1
Bug reports

Version: unspecified
Severity: enhancement