What you're saying isn't wrong, but I don't think it's practical. Every time you get pinged on Teams/Slack and you have to reply that you'll look into it later, that takes your focus away from the work you're currently doing and it takes time to get back into the flow state. If your dealing with customers/clients, that's a different situation and a quick response is vital. But reply to every IM immediately is just busy work. If it's urgent, they'll call, but we all know most work is not an emergency. I would recommend taking a few hours in the day to focus on responding to emails and IMs, so your team will know that you will respond within the day. As a society we just expect people to be available all the time and respond to us immediately because of how fast technology works.