Required to buy, the seller is at higher risk and wants to be anonymous and does not need to provide an address to fulfill orders... same goes for the host of the hidden service

I think what OP was trying to get at is that a dark web crypto exchange would not offer any benefit over a clear web one (both need to know who you are to send cash).

Meanwhile, there simply is not clear web drug store, so dark web ones don't have to offer anonymity to their buyers