I do like how I'm seeing people like your self trying to pull out this argument with absolutely no merit whatsoever.
Let me try and make this as painfully obvious as possible, you can not watch a youtube guide of hard darksouls bosses and then proceed to 1 shot it with with minimal effort required, and here's why:
Bosses in dark souls can have fast attacks and/or attacks that are hard to decipher quickly unless you're utterly attuned with the boss after many many attempts.
Dark souls bosses also don't follow a pattern of attacks making them very reaction based, leaving you little time to figure out what attack it's doing and how exactly you need to dodge it, including stamina management and not getting greedy on hits, and again, even with a youtube guide, you will not just suddenly know exactly what attack it's doing based on the first few frames of its attack unless you've repeated it many times over, and then it can go onto do another random set of attacks and just end you...again, even with a youtube guide.
I don't even know why I'm responding to you specifically at this point as you may as well just be pulling a strawman argument with how bad your response is.
Just to end with something I've said multiple times, I can watch a video of a boss fight on this game and then proceed to 1 shot the boss every single time after, and no, you won't be doing that on Darksouls unless you're literally a god gamer (not including savage etc due to the fact that you need to be with a team and memorize many hard mechanics with team positioning, opening up a whole other can of worms).
Not what I asked for at all, also how exactly is it impossible? this game has off-gcd abilities, these "dodge" skills I mention of can very easily be off-gcd