I don't understand the benefit - either system can accurately represent any integer number of pounds, right? And as you said, after a while the "weird" numbers become normalized after a little while. And it seems like you need the same number of different smaller-weight plates either way (45/25/10/5/2.5) vs d(40/20/10/6/3). If you want the plates to be integer multiples of each other, why not go with the already-widely-adopted kilogram weights?

Also, with d(6/3/1.6/0.9), you're still summing up odd numbers.