Question: Decoupling Drupal… Wait, what? why? when?

In a few words/points, decouple is good because:

• Unleash of cutting edge frontend technologies
• frontend technologies which are constantly accelerating and with which CMS’es can’t keep pace
• Lots of front end work that does not necessarily need to change when upgrading the CMS
• Which means also less friction between frontend and backend

Question: What is all this hype about