They had a test of small primer vs large primer and they only found very minor differences in ES and SD, so small I think it's mostly noise.
With reasonable loads their LRP brass can go 15+ loads before scrapping which to me is enough.
The fact that you can shoot LRP brass in almost anything pushes it over the edge, SRP brass can have primer cratering if the firing pin and firing pin hole are normal LRP size.
One guy did an expensive "high pressure" bolt upgrade in an AR because he was married to a bunch of Lapua SRP brass he had.
If Alpha can give me Lapua level of quality with large rifle primers, I'm going that way so I don't have to worry about shooting my bolt action brass in my AR.