Well just as the mass media, magazines popular actors drive people's way of dressing/looks the same way top warrior players may drive the warrior population in adopting certain builds...
Some time ago many warriors had adopted exactly Serennia's 33/28 build to the point, now things are changing again..and who is the driving force..
Serennia went to 35/23/3 wonder why he did it after so long on being 33/28. He copied exactly Inactive's build. He may even switch back to Stormherald just as Inactive did. Who knows. Do you really think it will remain the cookie cutter build?
I have also seen some warriors going 41/20 but it wont be "In Fashion" till we see one of the very top ones adopting it.