All of the factors that are important to guitar players around the world are affected by these manufacturing decisions. Once GHS has developed a formula that works - it is tested by both professional and amateur players. With favorable results - a new product is born. The products that players all know and love are never changed unless it is widely recommended by consumers. Our Boomers for example are still manufactured to the same specifications they have been since their inception.
Consistency is one factor that musicians rely upon.
When players buy a set of strings they want it to meet or exceed their expectations. They also expect that the next time they put on a set it will be the same as the last. Attention to detail at the manufacturing level assures consistency. We admit to being somewhat biased toward big wire for bigger sound. I would hesitate to say that heavier gauge strings have an advantage for tone.