I think many people don't even realize how inter-device their IM service usage really is due to how seamless the web frontends of WhatsApp/Telegram/etc. are. Some people like to use these when working on their desktop for 8+ hours a day.
I don't witness this around me. By far, most of my "real life contacts" will only use their phone to use messaging apps, and don't use whatsapp web at all.