"2) Remington has poor quality metal & isn't consistent in dimensions
3) Winchester isn't very consistent in wall thickness, weight & length"
Hummm.... been loading since '65. All brands of cases have some variations, by lot, but I've never noted any such firm and predictable results by brand. Sounds like conventional "I read it on the web" wisdom to me.
I really didn't see any particular "improvment" in accuracy with Norma cases (nor epanded primer pockets) in my highly accurate .22-250 that could be attributed to the brass so I quit buying it long ago. Never bothered with the expansive Lapua stuff but I really doubt there's any great difference in accuracy with it either.
Of course, the "you get what you pay for" crowd is right, in a way. I mean, if you pay for 100 new Norma or Lapua cases that's surely what you'll get!