Dieter Bohn argues that this year at WWDC, Apple should go all in and make nearly all of its consumer Mac apps with the new UIKit / Marzipan frameworks, including Mail, Notes, Messages, FaceTime, Photos, Reminders, and Calendar. Apple should just go for it, sooner rather than later, and ideally right now.
— Read on www.theverge.com/2019/5/29/18643448/apple-wwdc-preview-mac-ipad-apps-marzipan