yeah becuase everyone uses that term...
Ive been involved in weight training - BB for 15 years or so and its always been refered to as "assistance work"
Pullovers for width? Thats a newone on me Ive always seen it as more a serratus detailer though I can see it giving a good prestretch.
There is a powerlifter at my gym whos back work is pretty much deads and rowing along with explosive work like cleans high pulls etc ,never does chins and only uses the pulldownmachine to lightly warm up his lats and nothing more..he would have more width than you and I combined.
I asked for some tips on widening my back out like his and he said "row to grow bro"
Like you I to agree that you need to attack a muscle from different angles , but to discount rows and deads to just thickening is wrong.
Il try and get a pic of this guys back with my phone and post it up.its wide and thick , in fact all his training buddies are the same and none use chins and pulldowns are warm up so no big weight being moved.This guy stands out above them , it could be genetics but he is also the strongest of the group.
My SplitMon:Chest
Tues:Back
Wed:off
Thur:Legs
Fri:Delts,Arms
Sat:Off
Sun:Off