Well, mashing tech in CP is worse than holding the tech button.
Because if you are going to mash tech, you have to hit the tech button at the exact moment that it is possible to tech. If you're mashing you are hitting it imprecisely and it's possible to just overshoot or undershoot that split second where you can tech.
Whereas if you are just holding the button down you are constantly ready to go the instant the moment is available.