There's an entire dialect of English that has evolved just to handle expressiveness in text formats. There's a standard and reproducible grammar, and most people (who do or have spent any time on the internet in the last 15 years) use it a second language. Messenger services allow the flexibility of asynchronous communication with the added benefit of synchronous communication when it's important (that's why it's preferred often to email, for example).

Voice notes, like email, are fully async and require actually listening to someone talk, which changes the communication media that you're working in.

Messaging has risen to the prevalence it has because of the features it brings to the table, not in spite of them.

Imagine you have to communicate something precise to me and I am stuck in a meeting:

- you send me a picture, it may be ambiguous;

- you leave me a voice call, I have to go out of the meeting room to listen to it

- you write a message, it just works. If there is info to use, I will easily copy your message in any application (Excel, Word, SAP...).

Also, text can be stored easily, so I will keep an archive of your text, probably far less an archive of your voice message or diagram, as they are very heavy.