I’m familiar with estates. I’d love to see or read any data you have on “a chosen heir or select few at most” being the only possible (or even overwhelming majority) outcome. That doesn’t make any logical sense and isn’t how it’s historically worked in the past from my knowledge.

I have no doubt the majority of cases show wealth being paid out to more than one heir on average and that the dilution, although obviously not enough to combat wealth inequality, is still some amount of dilution.