I think it would be cool so that everyone could experience the content without having to worry about using lfg and whatnot especially if they prefer to run just with their friends or by themselves. To keep it fair, it could be made so that raid gear/weapons can only be obtained if you complete it with the original 6 man FT version, and not if you run the smaller team versions
That way everyone could experience the content, but only the 6 man FT’s can get the good stuff as rewards, and the smaller teams just get stuff similar to the end of a strike/nightfall
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I always thought each week should have a rotating raid encounter that was match made with a small preview before it starts to teach people the raid over time in small chunks