I don't know what happened exactly, and I know this kinda play has been around since the start, but it seems so much more exaggerated now than ever. I can only assume and use what I know now to try and figure it out, and the only thing that really makes sense is the fact that most new features in HOTS rely on dealing damage faster than everything in WoL.
Every new feature that is used in HoTS, well everything I can think of right now just deals more damage and faster than what it's predecessor did, or just more easily.
Oracles for protoss - you now can whip in a mineral line, kill 6 scvs and live to tell the tale before a terran is able to have anything there to stop it. That is not fucking starcraft. (They also want to buff the oracle, because it's apparently too slow.)
I can run randomly on creep, plant down 6 widow mines randomly and win an engagement despite totally not deserving to thanks to 6 huge detonations, neither is that. (widow mines are actually getting nerfed, which is cool - but I don't really think many people in the pro scene are whining about those too much currently.)
Hellbats - well luckily their reign is over, though I have a feeling they'll be rearing their ugly heads sooner than we think again, since a healthy 30 damage shot or what ever it is, aoe with blue flame upgrade alone for 100 minerals is too good to not use frankly.
Baneling busts of any varying degree consist of running suicidal units at a wall, and an army, and everything behind it. (If you're wondering why this became so much more prominent in HoTS than WOL, which I've heard a lot of people in my stream chat talk about when I lose to this strategy, then remember the fact that mutas were slower, didn't regen health like they do now and just weren't used 1/10 as much as they are now, I've had games where I go pure bio and hellbat, and actually ended up losing vs the sheer amount of mutas without having widow mines.)
A huge rant this turned out to be, and I guess if you want the TL
R it would go something like this:
I think units deal way too much damage in Starcraft, I also believe allins should not be half as strong as they are now. I want the game to be filled with good moves, on the fly decision making and well thought out strategies, I don't want cheap wins in which neither the doer or the receiver knew was happening.