I don't think its 4MSS is as bad as you make it out to be. Outrage and Dragon Claw basically do the same thing: give it a strong STAB attack. Yes, they have their ups and downs, but does anyone ever say that Mega Charizard X has 4MSS because it wants Dragon Claw AND Outrage? I really doubt it since I'm pretty sure the ONLY thing that it loses to without it is Quagsire (someone correct me if I'm wrong). In addition, the use of Swords Dance and Dragon Dance I think comes down far more to whether you need him as a wallbreaker / Stallbreaker or a sweeper / Stallbreaker, which I'd lean way more towards SD simply because we have so many better Dragon Dancers in the tier and so you have a better shot against Mega Sableye, one of the biggest threats in the tier. The only thing where 4MSS would be particularly bad is choosing a second coverage move since, as you pointed out, will leave it walled by a large portion of the meta regardless of whatever you chooseRemember when many was claiming that Greninja had 4MSS? The post that you has made about Haxorus shows that using Taunt on Haxorus causes a serious and real 4MSS.
Let's see the set:
Swords Dance/Dragon Dance
-Taunt
-Outrage/Dragon Claw
-Earthquake/Poison Jab
This would be set and you'll start noticing the heavy 4MSS there.
Swords Dance/Dragon Dance is not a case of 4MSS. Haxorus could use both moves and abuse them.
Outrage/Dragon Claw doesn't cause a move debate. Outrage is supposedly better but getting locked in sucks and having to switch out (or a 50% risk of getting confusion damage) is no good. ut I prefer Outrage over Dragon Claw because if Haxorus wants to do something, it's power.
Earthquake or Poison Jab. Here it's the big 4MSS: If you don't have Poison Jab, you can't defeat Fairies. However, Dragon move/Poison Jab is a bad idea because you would get walled by many Steel types in the tier (which is never a good thing). No STAB Earthquake doesn't hit Fairies enough. And if you lack Taunt, you aren't a stallbreaker anymore.
Now, does it have 4MSS? Yes, it does. Is it severe? Severe enough to keep it in the C's yes, but I don't think it's so severe that it outweighs the arguably now very useful niche of Mold Breaker + Taunt users.
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