In the same way that I never liked the Gmail categorisation, I don’t see the point in categorisation in Apple Mail, Thankfully you can switch it off.
Categorisation always strikes me as a feature for people who don’t manage their email, who leave everything in their inbox, even then it categorisation seems more trouble than it’s worth.
And the AI summaries are garbage at the moment, hopefully they can improve them, and quickly.
Has anyone else found this to be a winner?
No. I don’t use the Gmail categories either. I have 3 labels, one is for tax purposes, the second “Review” contains all messages that contain the word ‘unsubscribe’. And the third is one I use with messages that I may refer to often.
I have three rules that keeps everything out of my Inbox except the messages I want to see when they arrive. AI can’t improve on that for me.
I turned off the icons and the categories. Then after a couple days I decided to download Spark again. In iOS while reading an email, I only see an option to archive the email. I have to press and hold that button to trash it. Small things like that add up. Swipe gestures are better, snooze actually functions like I think it should (email goes away until needed) and the consistent format of the emails makes it just feel tightened up a bit.
I should clarify – Spark on iPhone only. iPad and Mac still run stock mail app. For how long, we’ll see.
Being in Germany I cannot try that feature yet; but being skeptical about that feature from the start this article didn’t really help to convince me
Guess I will turn it of after 2-3 days 
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Why can’t we just get rules - like in Reminders or Notes - instead; even if limited, I think I could make more use of that than the categories