How secure do you think face-to-face conversations are? (not sarcastic or anything, just genuinely interested on measuring security of conversations)
(1) a government is already specifically interested in you or the person you're talking to when you have your conversation: both the fact of the conversation and the content of the conversation can probably be captured pretty easily.
(2) no government is specifically interested in you prior to your conversation, but you take no special precautions: the content is probably secure, it's probably not being recorded, but your location is probably recorded so if you later become a target of interest then the fact of your meeting is likely to be recoverable.
(3) no government is specifically interested in you prior to your conversation, and you take precautions (being careful about when and where you meet, and not bringing your phone): probably your conversation is reasonably secure.
Not to mention a) arranging the meeting and b) getting to the meeting need to be performed some how. Getting from point A to point B is, in today's society, not a surveillance free affair. Everything you carry can be used to track you, and even if you carry nothing, hundreds of CCTV cameras can likely follow you along the majority of your chosen route.
Thus the 'metadata' of your meeting is still known, even if the contents of your meeting isn't.
I'm thinking of cellphone tracking, automated plate reading, good old surveillance cameras, bank transactions, and whatever your computers are collecting unless you actively fight to stop them.
Plus, it is a bit harder to mass surveil people, even with voice recognition, as one can go into a crowded place (or, well, could, barring current circumstances...) so most of the audio is drowned out.