After 2 weeks on iOS 18.2, I've fully disabled all of the Mail features. The Siri priority box, summarizations, sender contact photo and the labels system.

The truth is, I am at Inbox Zero every night and already have really complex rules setup and get about 25 personal emails a day and so I found everything just robbed space from the actual emails and made it more difficult and I ended up spending MORE time in Mail than less.

If you can't manage your inbox, these features are great.