You don't think this is a big issue at all? A small business with razor thin margins could very easily lose money and lose the capability to pay their suppliers in case of a slide. That alone makes accepting it unnecessarily risky and very far from ideal. It's fine peer-to-peer, but when you have an obligation to pay and a business to run, it's a significant variable you could just do away with. They could use a payment processor to mitigate the risks, but that also defeats the purpose.

Volatility could very well be a deal breaker in a few scenarios. While I acknowledge that it gets blown out of proportion here and there, it's certainly not a non-issue. If it works for you, and it does for most of us, great. That doesn't mean it will work for everyone else though. Volatility is a problem that can presumably be solved by time and adoption, and shouldn't be swept under the rug.