And again, I fail to see how this hurts writers. You can be a successful writer without being an MWA or RWA member.
If the chance at winning an Edgar is the only benefit of membership, then you're right. If there are other more or less intangible benefits of membership, then it might be a minor problem for the ones that want to become members.
It's not a BIG career-breaking problem. But I'm sure it may sting a bit. It's not really a big deal, tbh.