I myself have seen shooters engaged in competition shooting using all brands of brass.
For my humble needs I really like to support the American Company's suppliers of brass shell casings.
For a number of years I have been using either Starline, or Horandy brass shell cases with no terribly adverse reactions.
Ya I know that I may get an occasional piece of brass that is either over or underweight by a gram or so. Well to the short answer is I just cull them.
For me and my supplier of reloading components it is just a simple matter of picking up the phone and placing a re supply order. He is located about 10 miles yonder down the road and I can actually have what I need in less than 1/2 hour.
You will not get an argument from me about Lapua, or Norma brass (it is superb) I just can not justify purchasing in large quantities as the price just kills me. I know ,and agree that you get what you pay for and will reserve its use for when extreme accuracy is required such as competition shooting or more importantly hunting.
When I need some long gun ( which is often) trigger time at my range I will almost always stick with Starline Brass
As in my case is a simple matter of supply and demand
OBTW I have done side by side comparisons and must concede that my ES,&SD groups are a little bit tighter using the Lapua Brass,(but this again depends on atmospheric conditions which change hourly here in South Western Florida) ,hence I reserve its use as stated above.
Just my 2 cents worth !