In the section 'Where it works' is a lot of information on using alternative slashes. I believe this is unnecessary information, as I have never seen people using these strategies to work around the problem of slashes.
Topic on Help talk:Subpages
I was the editor who added that information, and although I recall having a particular use case in mind, I forgot what it was and can't figure out from my edits to mediawiki.org on that day (12 May 2011). I know I talked to Brion about this, possibly on IRC, and it might be worth digging the IRC logs to find out what was my main motivation, as it might justify keeping the information for others who share the same needs. In any case, it doesn't seem terribly important, so feel free to remove the information about alternative slashes; this thread and the history of the page should be enough to get one started should it be necessary to unearth the info again. Cheers!