^ Except only opposing stall teams (and maybe balance) ever run Heal Bell or Aromatherapy, because of the inherently defensive nature of those moves :/ if you use those moves on an offensive/ HO team, then you'll lose a ton of momentum (which those team archetypes live and die on). Also, because offensive mons typically only get one chance to set-up/ sweep, it's unlikely that you'll actually end up healing a frail sweeper or the like.
Also, defog does remove hazards from both sides. Which means that it can be equally as much of a pain for the user as it is for your opponent. Also, a good number of pokemon that learn defog are Stealth Rock weak, so switching in to SR and taking 25% in order to get rid of it isn't ideal. Not saying defog won't be great, but there's no denying that it has a negative side effect which the user has to consider when choosing whether to use the move, or if Rapid Spin would be preferable. Defog does not outclass Rapid Spin.
I still think that stall is going to be (at least) better off this gen than it was last. I just think that the type chart changes (broadly speaking) allow for more synergetic defensive combos. Also, the weather nerf (which powered up offense more than defense, arguably) is pretty crucial, and power drops in some moves (Fire Blast/ Hydro Pump etc., Hidden power) helps some as well. We also know that some key offensive threats (like Breloom) have received some significant nerfs in their effectiveness (ala Spore). I suppose it all remains to be seen though. I can't wait until we have more concrete information about the meta; atm, while we have some information, we still lack a lot of the crucial technical info that will impact the gen 6 meta. Just based on lack of info if nothing else, I think calling any playstyle 'dead' or 'overpowered' is more than a bit of an exaggeration.
Also, defog does remove hazards from both sides. Which means that it can be equally as much of a pain for the user as it is for your opponent. Also, a good number of pokemon that learn defog are Stealth Rock weak, so switching in to SR and taking 25% in order to get rid of it isn't ideal. Not saying defog won't be great, but there's no denying that it has a negative side effect which the user has to consider when choosing whether to use the move, or if Rapid Spin would be preferable. Defog does not outclass Rapid Spin.
I still think that stall is going to be (at least) better off this gen than it was last. I just think that the type chart changes (broadly speaking) allow for more synergetic defensive combos. Also, the weather nerf (which powered up offense more than defense, arguably) is pretty crucial, and power drops in some moves (Fire Blast/ Hydro Pump etc., Hidden power) helps some as well. We also know that some key offensive threats (like Breloom) have received some significant nerfs in their effectiveness (ala Spore). I suppose it all remains to be seen though. I can't wait until we have more concrete information about the meta; atm, while we have some information, we still lack a lot of the crucial technical info that will impact the gen 6 meta. Just based on lack of info if nothing else, I think calling any playstyle 'dead' or 'overpowered' is more than a bit of an exaggeration.