The technology to do all of those things existed well before iPhones & Macs appeared. You may argue that "yeah but he made them popular", but the iPhone & Mac users were never in the majority.
It makes such a refreshing change to have a web page not cluttered with adverts and popups. Just nice, clean, well-spaced-out text and simple organisation.
GDScript is closely tied to the engine, making it incredibly easy to affect any part of your project. It's also very terse and simple to use, and anyone with a passing knowledge of Python should be able to pick it up in minutes.
I've used C# for my day job for years, but never felt the need to stop using GDScript for any of my projects.
Godot much prefers composition over inheritance. It's possible to use inheritance in Godot, but no-one recommends it, except maybe for a data structure.