This is quite true, having these types of abilities on the global cooldown would probably make them feel clunky, on top of that it can waste part of the time that they are active in order to begin utilising them. Also remember that these "Swifty" macros are an all or nothing venture, they are not a guaranteed "I-win" button.
But that's the point! Sometimes convenience just isn't that fun. Does your StarCraft 2 team also consider making the Phoenix lift ability autocast and cost 0 energy?
Eherm; If cooldowns scale multiplicatively off each other, and they do, then it should be completely obvious that some mechanic has to make sure they're not always worth popping all at the same time. The more you pop, the less you get out of each one beacuse you have to wait - but the more they scale off of each other i.e. you give yourself a smaller window but higher burst inside of it.
Your quote largely addresses PvP, which is of course no surprise considering where we are, but think about the PvE implications of not putting them on the GCD. Swifty one-shot macros are rampant in PvE, too - except they don't actually 1-shot the boss. The thing is, even if you don't 1-shot, this design makes it higher overall DPS.
When a player pops all of their cooldowns in one big hit, they are taking the risk of simply wasting them because their opponents go on the defensive. The choice to use a cooldown is exactly that, a choice, and it can backfire. When it backfires, the player using the cooldowns feel they should be compensated because their damage is now lower and they feel their cooldowns need to be up again to be useful. When it works however, the person that's on the other end feels it’s completely unfair, even if they are able to survive it at other times through their own reactions and defensive abilities.
Okay, so this is the fundamental problem I have with amassing huge amounts of cooldowns off the GCD. We concede, do we not, that the game has a lot of CC and that you can lock people into stuns relatively easily. Then, add to that that it simply gives more DPS, not just more burst, to stack them all at the same time. Now, pepper this problem with a good old dose "not enough buttons on the bloody keyboard" (feral has 55 abilities! :D ), and it begins to dawn on you just how bad this design is.
It's an all or nothing game. It's a 1-trick pony.
It feels terrible for both parties if it fails:
Attacker: Omfg I popped everything and it did **** all!
Defender: Omfg the damage is just crazy stupid!
If it succeeds:
Attacker: Hahahahha this is ridiculous lawl.
Defender: Ok this needs to be nerfed...
The reaction is ALWAYS negative whenever I hear about this stuff. But the problems it causes go far deeper. People need to be able to realistically have a shot at surviving this, so we have to add even more cooldowns. We start adding a crapton of defensive cooldowns and massive healthpools to the game and now, outside of cooldowns, everyone's damage feels completely worthless. Feeling worthless for 3 minutes so you can shine for 20 seconds to do maximum overall damage just feels really bad.
That chance and randomness in fighting people with different skill levels to counter and react to the strategies of another is part of what makes PvP more engaging and exciting.
Let me know when you acquire the reaction time "instant".
This is exactly why we're bloody proposing putting it on the GCD. It actually gives us time to react, thereby making PvP more exciting.