I realise this will be a contentious issue, however I think it needs to be talked about as it is potentially also a divisive issue as regards the community, by saying which I'm not attempting to use weasel words to lend my post gravitas, but rather to say it has come up in conversations I've had with various people prior to and after the patch, (whom I don't feel entitled to speak for) and I've seen one other poster, besides myself, voice the same concern in these forums.
Namely:
People are looking at the changes to the mercury, then competitive play styles and concluding there is a link. How anyone could get that idea is fairly easy to explain:
There area numerous threads in the forums either specifically about mercuries being used in competitive matches or mentioning them being used.
There are the threads concerning testing in the Dev App and point to who is giving feedback, though I will temper this by also pointing out not everyone who has the dev app posts feedback, those that do are merely the most motivated
I also ask that the discussion remain respectful.