While not directly comparable, text messages do often see some lag (especially when also considering something like MMS) so it could be said that there is some tolerance for latency. A more distinctive difference could be the lack of rich media functionalities (sharing GIFs, stickers, etc) that have seen popularity in most messenger apps. This seems to be a middle ground between traditional email (professional) and mobile chat (casual) which could see some use but I can't imagine how user adoption would follow