I see you were not burdened with a great amount of schooling so I will keep this simple.
Just because I can choose to bring a knife to a gunfight. Does not make it the right choice.
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Nothing about the old raid weapons made them the be-all end-all choice that you're insinuating. What made them particularly useful was the burns put on the weapons, which only really mattered in things like nightfalls back then. So yes, you could switch things around all you wanted with little to no consequence when the only benefit was additional damage or making it slightly easier to take down shields.
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By sheer virtue of having a burn it tilted guns to becoming a must have. Then with the added meta involved one of those would end up becoming the must have. First it was VM then icebreaker then faitbringer and so on and so on. The same with perks after a while the perfect rolls came out and the game devolved into getting those guns with those perks. This is bungie nerfed stuff, now it's a case there are better and worse guns out their but their is no perfect answer. This year's raid guns are perfectly viable. It's just their -blam!-ing ugly :p