It is a repository, a discussion medium, it is the pot of GO(ld) at the end of the rainbow! SL is whatever you make of it.
I am a fan of less words, more content -- especially with the front page.
If no one cares deeply about this line, I will move it to a lesser page.
Why delete it? It is a very nice line to use as an introduction.
I've always rather liked that line. Seems like a friendlier introduction to the site than "Hi, we're a collaborative web site".
In the spirit of your (jared's) homepage:
"If these admittedly peripheral wiki entries amuse, or educate a single user, then they have served their purpose."
Let's think that if this line entices a single additional user to explore SL, it serves its purpose.
seems you guys like this line -- let's keep it! :)
Start with this - https://senseis.xmp.net/?HowToUseWiki . When you read all, you should understand SL better than 99% of users. Good Luck!