In reply to Khoa.

Though I only use the block editor sparingly and, it falls short for certain use cases, I agree that it should be in core because in many ways it’s a big improvement over the Classic editor which has been showing its age for a long time.

That said the way it was implemented as default, requiring a plug-in to re-instate the older editor was wrong, when one can use a simple line of code in child theme’s functions file or other custom plug-in. A simple switch in settings would have sufficed for this and wouldn’t have put the wind up those who still needed to use the old editor. Then again “putting the wind up users” may have been a deliberate move.