The ballistic tip is just a modern version of the old Remington bronze point. That is, a hollow point bullet with a wedge to start expansion. And, I am sure that the plastic tip is a heck of a lot cheaper to produce than the solid bronze point. The knock on the ballistic tip is the same as the bronze point--often overexpands at close range.

A deer is not a very difficult animal to kill. Good shot placement with any decent bullet will kill very quickly. I see no need for the so called premium bullets on deer. A Rem. core-lokt, Win. power point, Sierra pro hunter, Hornady spire point (or whatever it's called these days) will do a fine job, and have been doing it for me for more than 50 years and several hundred deer.