Using 0-conf is restricting usage to "friends only" which is a tiny subset of who you may want to send money too so I think you've already answered this. Also

Using 0-conf is restricting usage to "friends only" which is a tiny subset of who you may want to send money too so I think you've already answered this. Also moxie replied in his twitter about why not monero stating they wanted a "non custodial" integration, not sure what he means but you can ask him.