First, I never wanted to see anyone in personal and do cash trades because it is highly risky as well as we are loosing our anonymity while doing such trades. I have been asked by multiple people to trade with them personally on LBC platform but I just simply deny them with no further questions.
If someone is willing to trade with physical cash means the source of that money is in big question because if they are legit tax payer they can simply use their bank account for safe trading.
Cash trades are definitely not for everyone but I disagree about the anonymity part and the source of money. Regarding anonymity, done correctly, a cash trade only reveals your face and the bitcoin address you sent from TO another trader. Compare this to an online trade (like a bank transfer) where you use a platform (whatever it may be): in that case, the trade itself is usually recorded on the platform, the bank details are usually revealed and stored by most platforms and the bitcoin address it is sent from and sent to is also stored. Now, not only can the trader you are trading with trace you back with this info but also the platform. Even if the platform encrypts all of this info like we plan on doing, I'd still take the cash trade over the online trade if I want to stay private but that is just me and you might not see it this way. Regarding the source of money, it's not fair to assume that all cash traders are criminals. On top of the privacy it offers, it also is a way to trade without worries about getting blocked by an entity (like a bank) or reversed by the bitcoin buyer. For example, I don't know where you are from but doing bank transfers between peers for Bitcoin in North America is discouraged and your account can easily get frozen/locked if they know you are trading Bitcoin.
It maybe okay for someone who trade in hundreds but what if we are going to trade in thousands of dollars too often, we are risking our identity to someone so they know how much money we are making in such time intervals.
You are also at rick of getting kidnaped for such reasons.
You are going to spend more money to do such trades than trading on online platforms and the list goes on...