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 We need to somehow have a unified order book no matter what client a user chooses or the liquidity will be fractured and/or centralized

I don't think in-person cash trades were all that popular and the pulling a gun thing was always possible, not unique to Haveno, that's why you should meet somewhere in a public area if you do that

Cash-by-mail and payment apps seemed to be the most used by far iirc 
 If it's centralized, then it’s one person for the government to make an example of, as opposed to multiple seed VPS the user picks from in the client.  There's ways to do order books that have liquidity, look at BasicSwapDEX.
There should be at least two competing groups 
 I agree with you that's what I meant worded it badly 
 btw check your DMs 🤙 
 Robosats is not completely decentralized (it's federated) but at least different federations share the same order book, although the order marker needs to decide a priori which Federation will "host" and arbitrage the order.
I didn't know that bisq/haveno had this issue. I also don't know how arbitraging will work for Haveno. Bisq used timelocked multisig, but there's no such thing for Monero...