Obviously the idea is not that one sentence resolves all further disputes.
There are other concerns than the main one. However, look at artofcode’s suggestion & modify it a bit:
community-oriented, Q&A-based knowledge-building software for selfless people
That would have saved us a lot of points in that reputation discussion, if somebody could say
“look at our statement, we do not want answers from people who do it for points”.
Same for the current question if beginner-friendliness is our main concern; the answer would be "no, although that will probably happen a bit automatically under our current goal, [quote statement].
Same for this question about chat. It wouldn’t help resolving it, but saying “Look at our statement; we’re community oriented” would be a strong point for having chat.
Then there’s further discussion to be had about if MVP or not where it doesn’t help much, but overall it will speed up the discussion a bunch.