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I hate that. Also in a business setting. By definition a message (be it text, email, whatever) is not urgent. They might be important and of course you shouldn’t leave them unread for days, but for urgency there’s calls.
I always perceive an IM as high but not immediate importance, an email as “get to it when you can”, and phone call as immediate.
The older people I work with tend to call for email level things.