Yep, it's insane how much control you have in the last two AC games. Quick tips OP, pick and choose when to tap or hold X or O while running. DO NOT just hold X at all times. You need to think of the level design as a 3D space and constantly decide what move to make next to keep your momentum going.
This is just using R2
This is what happens if you hold R2+X after as you're swinging from the first monkey bar
This is what happens if you hold R2+O as you swing from the first monkey bar
A bit more complex.
This is what happens if you hold R2+X for the first jump and then hold O as you grab the monkey bar followed by double tapping O to roll, which negates fall damage.
And this is what happens if you slide and use the parkour down control followed by just holding R2
Always remember that R2+O while running=vaulting to get over obstacles to keep your momentum going
You'll notice in all of these gifs that he's stopping on a dime as soon as the player lets go of the controls too instead of walking forward a little bit like in say GTA, the game absolutely has very little animation priority and will even interrupt finishing moves for a parry. They absolutely depend on you to be able to think on your feet, (or like an assassin), to figure out what to press at what time in order to make an escape, cross a rooftop, or close the distance between yourself and a target.
So the problem isn't necessarily the controls OP. Unless you consider a learning curve and skill gap to be a problem?