Yeah, sure. And I usually build up a set of filters and rules so that my inbox is manageable, but I think the compassionate point of view is that email is loaded with more disposable and management heavy communications than slack tends to be.
I have seen plenty of bad practices in slack. In particular, there is more and more of a tendency to treat slack as "publication of record" as opposed to "ephemeral missives".
Slack was where work got done. Email, less so.