My question simply pertains to: "Why shouldn't a build matter in PvP?", or rather maybe it should be "why shouldn't it make a difference in PvP?". Perhaps I misunderstood, but the build should truly matter in PvP, as it should in PvE, as it should in any situation regarding any type of conflict.
Being prepared is important regardless of the situation. Someone who has spent the time optimizing for PvP/PvE/whatever should *always* (read: more often than not) dominate over someone who is not specialized in the given situation. A person who has given no thought about fighting other
humans should be aware of the dangers in a PvP area because it is entirely different from fighting monsters. (Though some could argue that humans make better "monsters"

) It is simply that they are not prepared for the given situation, some builds will inherently be better in some situations as opposed to others, this will and should always be true. In my opinion thats why AT's were devbelpoed in the first place so that everyone could have their role to play.