I'd like it if audio were on the way up. On WhatsApp I send lots of audio messages but the amount I get back in return is small. It's so much easier to hit record than to try and type on a tiny virtual keyboard. Text is great for my laptop, short or long audios, for my phone. No calls, though.

Actually, I find audio messages more like writing, in that one can think about what they want to say and there's no pressure to say something "right this moment", as with a telephone call. Likewise, the person receiving the audio message can listen to it when it suits them.