Almost all of the apps bundled with macOS are written in Cocoa (some are written in Cocoa Touch, which is itself a nearly 15-year-old framework). And a great deal of excellent third-party apps -- off the top of my head, Transmit, Pixelmator, Day One, the Omni Group apps.

The bundled apps feels like an odd claim. I don't think of many of those that feel modern. That said, I'm probably not thinking of the right ones.

Will try to take a peek at the rest of this list. I don't, oddly, use that many native Mac applications.

> I don't think of many of those that feel modern.

This is a bit interesting to me, which bundled apps don't feel modern to you? Mail, Notes, Pages, Safari... they all seem modern enough to me.

Mail has always felt like garbage to me. Notes, I will have to give a try again. Though, really, the entire "office suites" that everyone makes always feels off to me. I will full cede that that is just preference.

Safari feels off, as well. But I'm pretty firmly in camp firefox.

When I think bundled apps, I think of their notepad equivalent. The finder. The calculator. And... that is about it. I remember trying to make a script once, and that script editor left me very very lost.