crairezx20:
Right, so normally, your counterparty only knows that's address' pub key along with the rest of the network when you spend from that address.

I've heard how this provides a little bit of extra protection from the threat of future quantum computing, because if you spend from an address only once, then the network only sees that pub key for a few minutes in the mempool before the next block is mined ontop of it.

I'm wondering if there's any other privacy/security concerns coming from your counterparty learning your address' pubkey before you spend from it (besides a little extra protection from the tiny threat of them having having access to future quantum computing). 

and yes, I understand the basics of why mixing is important.