That's a non-sequitur. Of course all things being equal including penetration, a larger diameter wound channel is advantageous. You don't need a larger meplat to get a large wound channel though., especially with a soft lead .50 caliber bullet.
The bullets I've been shooting are pointed with plastic tips. I use them because they're accurate in my rifle, not because of the shape. I have a collection of them, collected mostly from underneath the off-side hide. They're fully-expanded, to the size of a quarter. Some would say they expand too much.
