Welcome! The build is surely something else. If you want a build that is even easier on the wrists, have a look at the Passivist builds we came up with; they do not use buttons at all (as a challenge, the builds are by no means top contenders).
I haven’t been playing the game as much lately, so I doubt I will update this soon. As for the theoretical endgame setup, I scrounged the database for stuff that improves Counter Strike and Vindictive Flame, with the goal of reducing the cooldown of both as much as possible. The thing runs on 3.3k hp regen and 3.4k DA, with 66% block chance for 7.4k with over 100% reduced block cooldown. This is affixless and without components and augments, so I doubt it will die against anything really.
That being said, I have no idea on how this performs since I never got to this point. What I do know is that this build thrives against hordes of trash, but takes considerably longer to kill singular enemies, especially if they do not attack in melee and have slow attacks. From a purely theoretical standpoint, I think this build could survive SR and Crucible, but I have no idea how fast you will be killing the bosses.