That isn't fundamentally flawed, staying in it for extended periods because you are otherwise outclassed is the problem.
Using it as a quick change weapon like he did against the ship, the number and in snakeman quickly against Kaido is fine. In, attack, out, unless you are 100% sure of victory.
Zoro can't stay in adv CoC mode without draining his life force, but it's still a good trump card, Law and Kidd can't control their awakenings properly etc.