You guys make it seem like defog hasn't made hazards easier to deal with. Without bisharp to punish defog, really there is no stopping a pokemon like mew from blowing those things away, if there every much of an issue to begin with. Especially with a wish supported defogger or spinner.
I had no problem keeping Chansey healthy when she was legal, the teams I made with her were practically invulnerable, Blissey while not being as bulky does has less demand for healing due to being able to carry around leftovers. Lets not forget how much of an issue Chansey was even WITHOUT her Eviolite, Blissey is all that and more. I genuinely think she is going to cause the same issue Chansey did. Of course don't ban her right away, but I would say she deserves to be on a potentially broken list
with a stall team it is not very hard to keep everything at a healthy amount, obviously the switch in is not going to have a hard time surviving unless you're running stuff like Houndoom who has butter physical defense
Doublade isn't bad, its almost as good as Aegislash at sweeping with shadow sneak alone.
Its "Assault best" Eviolite defense let it shrug off SE physical attacks like EQ and knock off relatively easily, while setting up, very few things can take a +4 shadow sneak, and you would be surprised how many physical attackers let that happen.
Being the only thing outside of Maggron bulky enough to even think about surviving a Super effective V-create or Flare Blitz deserves some credit, and it goes to show how little non-stab EQ and Knock offs (which are literally everywhere) will do to him.
Not to mention with Blissey around every single special attacker outside Keldeo (if it comes back), Reuniclus and a the sub players are instantly and easily walled, making doublades soft sp.def less of an issue.
I know doublade has its downsides, I'm not trying to say its perfect by any means, its just example that it pairs very well with Blissey, and I know for a fact it is not the only thing that does this. but it does wall some of her biggest issues. And Uses the opportunity well to easily sweep weakened offensively based teams.
Bissey is obviously not the second coming of Kangaskhan but I feel it still has the potential to shift the tier very heavily because for the simple reason that Chansey was still very resilient and her wishes were still a large issue even without the Eviolite. While the only thing that has really weakened Chansey this gen is the fact that knock off got a very large buff and IMO was the only reason she had any business in UU to begin with.