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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Raids have never made sense to me because in the promotional material leading up to the first Destiny and the story emphasis on fire teams of 3 it's just weird to suddenly need 3 more players when we spend the majority of time leveling and grinding in small teams. Personally, I wish Bungie would stop making Raids and instead just give us 2 Dungeons per expansion. Bungie can still do great scenery, platforming, puzzles, and massive bosses with just 3 players. Dungeons are just more manageable and straight to the point.