[acemarke]

Tell that to the developer communities for Microsoft, Apple, and Linux. Quick, should I develop a new Windows GUI app using Win32, MFC, ATL, WTL, WinForms, WPF, or UWP? Which of the five million flavors of .NET am I supposed to be using right now? Should I be developing Mac/iOS apps using Cocoa or Carbon, and writing them in Objective-C or Swift? What about Qt (or KDE's variations) vs Gtk, and use of Mono or Vala?

Yes, I'm somewhat deliberately conflating languages and libs there, but my point is that while the web dev world has certainly been churning quickly, there's also been tons of churn on the desktop and backend development fronts as well.

[LeoNatan25]

The churn you are conflating is over a period of decades for almost each mentioned, whereas here, the turnaround of frameworks is a year to two.