"Hitters are all individuals and do not use just two different mechanics. As a matter of fact the number of mechanics that are taught by good coaches is uncountable...Doesn't anyone realize that no two hitters are going to be or try to be exactly alike in their approach or swing mechanics. So why do you try to catagorize hitting mechanics into just two categories (linear/rotational)?"
This sounds good, but it's not based on facts.
The facts are that every human body works pretty much the same and the laws of physics are also remarkably consistent. As a result, there is one approach which is used by most high-level hitters (aka rotational hitting). People who don't use that approach generally don't make it to the highest levels as a result.