I appreciate all the effort you put into this post, but you're just gonna get downvoted by people who get off to farming noobs in Crucible all day and it's gonna fall on deaf ears.
My take is that they need to go back to the "most everything has SBMM aside from 1-2 dedicated playlists with only CBMM" model and loosen up the SBMM restrictions. Not a whole lot, but enough to remedy the 20 minute queues for people at the extreme ends of the skill curve while still ensuring that New Lights don't get matched against triple gilded Flawlesses for their first game.
After all, that's the single biggest problem that CBMM-only causes. New players get matched with people they have no hope of competing against, go "this is awful and not fun at all", and never come back. For every new player that goes "looks like it's time to git gud" in response to going 0-30 in Control, you have 20 or 30 new players that abandon Crucible entirely instead. You're throwing new players into the PvP equivalent of GM Nightfalls when they're barely ready for playlist strikes and they're rightly deciding to leave.
In a perfect world, you'd have a hybrid of the two models, where the higher you are on the skill curve, the less the game factors in skill when deciding where to match you. But there's no way Bungie can program or tune that properly, which is why I suggest going back to the model I described earlier. At least that way, the CBMM playlist functions as a quarantine for all the sweaty noob farmers while everyone else can go chill in the other playlists with loose SBMM.
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Yes a hybrid would be great. I think they could pull it off. If they wanted too. But who knows if they would want to. Maybe the best we could ask for is just the separate playlists. Like you mentioned.