While a poor grip may work, a better grip is just better. People don't often know what they don't know. If you don't know your grip is poor and no one tells you, you'll never know.
Sure, there are different ways to grip a gun, but the physics of recoil control don't change and a "proper grip" is beneficial to all.
Having had a Bersa .380 such as the guy in the other thread, and having coached people using that Bersa, I can honestly say that tea cupping that thing is ineffective.