This is a very regionally desirable feature, in my experience.
I have never (deliberately) sent a voice message on any platform, nor do I know anybody (well/any more) who would. But I went to a university with a high proportion of Chinese students, and it was really striking how much that feature was used (in apps that supported it obviously).
I'm just speculating, but I wondered if it was at least partly because of the tonal nature (roughly speaking: four intonations for each vowel, rendering completely different words, not just subtle changes in tone/emphasis) of mandarin, and relatively large number of different characters, making vocal communication more efficient than written; to an even greater extent than that may be true of English, for example.
I'm not really sure what I'm saying. Maybe it's not good to burn one market, maybe it is good to focus on excelling in others if (if!) the alternative is mediocrity everywhere, I don't know. Your comment just reminded me and I thought it was vaguely interesting.