If we start discussing the game before the first move, it will only be a matter of time before someone makes a comment during the game which could be seen as assisting team-mates.
Don't be so grim. I tried to do pre-flight briefing (but nobody took care ), and occasionally make comment like "Hey, would you please stop hanging around long enough as to shake that plane off my tail? TIA!". It did'n result in bad-habit spreading.
As usual, the only real limiter is good taste and common sense. Two things that, luckyly, are quite common and widespread in this site.
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