Call me whatever you like since the truth hurts.
All dungeons, CT raid, Guildhest, Pvp, Alex Normal use the same server. This is what the Raid server avoids, the lag and congestion of having to wait for a slot to open up.
High End Raiding requires very low latency, voice communication, dps checks, food, Pots, reliability. DF will not provide those, and thus wiping during the 1st/2nd Phase 24/7 in the 1st few mins. It's a complete waste of time, and you call that nonsense? Really? Don't even talk about putting it in DF unless you cleared A3S and progressing/downed A4S. Those fights are on par with SCOB Savage Ilvl 115. Experience will never come forward in a DF group.
Once on DF, people will start complaining it's too hard and needs to be nerfed because I couldn't survive it, it ruins the whole experience for the raiders who wish for a challenge. This is another reason it stays off DF.
SE listens to feedback and suggestion but only if the "MAJORITY" vote on it, however only if it's reasonable to do so.