Category View introduces a simple way to organize emails by type
It wouldn't be possible for me to overstate how much I dislike this feature. It's one thing I can't stand about Gmail and from what I've observed, iCloud has this now too. I'm wondering if people actually find this more useful than a hindrance. I mean, I have spent days with several email addresses creating my own filters so I get not everyone can do that. But the way this is typically implemented just seems like another spam mailbox that no one's going to check.
I assume they will but if Proton doesn't have a way to disable this, I am out.
Manage newsletter subscriptions
What would actually be cool is a dedicated newsletter app. I use BigNews as an RSS reader and newsletter reader. They give me an email address just for newsletters. It's fantastic.