Does that app use Electron, Catalyst, SwiftUI, AppKit, or is it an iPhone app? How to find out easily.
SwiftUI, notarization, malware detection, and Time Machine for APFS: all look worryingly incomplete in Catalina. Are they a bit premature?
Was WWDC a damp squib after all? With only one new unaffordable Mac announced, and more dreadful privacy dialogs on their way, you might think so.