SharePoint Framework Extension (SPFx) - Recap

Here is my quick recap on SharePoint Framework Extension (SPFx).

1. Supports open source  development for creating the pages and web part for SharePoint.
2. Client Side rendering (Performance and  overhead on  SharePoint Servers offloaded)
3. Mobile optimised ( Responsive rendering through underlying technologies being used in Page or web part development).
4. Supports widely used Tool Chaining development approaches (Yeoman,npm, gulp, Type Script etc.).
5. No more JavaScript Injection and IFrame model (SharePoint Add-Ins heavily relies on it and often considered as security threat to SharePoint data)/
6. SPFx enforces SharePoint permission model to run and deploy.