> As for OLE, you're actually thinking of COM, not OLE. They were co-developed together: COM is a cross-language object system (like GObject), while OLE is a set of COM interfaces for embedding documents in other arbitrary documents. Like, if you want to put a spreadsheet into a Word document, OLE is the way you have to do that. Microsoft even built much of IE[0] on top of OLE to serve as its extension mechanism.

Oops, you are right about COM. I got them mixed up because I was thinking of the integration in WordPad.

> Mac apps are Mac native because Apple gives enough of a shit about being visually consistent that anyone using a cross-platform widget toolkit is going to look out of place. Windows abandoned the concept of a unified visual identity when Windows 8 decided to introduce an entirely new visual design built around an entirely new[1] widget toolkit, with no consideration of how you'd apply any of that to apps using USER.dll/Common Controls. As it stands today, Windows does not have a good answer to "what widget toolkit do I use to write my app", and even Microsoft's own software teams either write their own toolkits or just use Electron.

Mac apps are Mac native because the APIs are amazing and the ROI can be really really good. It takes so much effort to do the same from scratch, especially cross-platform, that, you're right, I can smell anything written in Qt (because the hitboxes and layout are off) or GTK (because the widget rendering is off).

With that said though, wxWidgets seems to translate EXTREMELY well to macOS, though last I used it, it didn't have good support for Mojave's dark mode. Maybe support is better nowadays. For example, Audacity appears to me as just a crammed Mac-native app rather than blatant use of a cross-platform toolkit, and wxPython used well can be completely mistaken for fully native.

wxWidgets calls the underlying native controls directly; Qt uses it to inform how to render but still does its own thing, at least according to a discussion I had with a Qt engineer some years back.

(I am open to being corrected)

wxWidgets has properly supported dark mode for a bit now.