Every blog post has infinite things it does not mention.

"Technical substance" simply requires that some technically substantive things are mentioned. Which was indeed the case.

Not about the things that matter.

If you write a blog post about "I switched from X to Y", I expect the WHY: the pros and cons of X, of Y, and of the alternatives that were considered and dismissed before considering Y.

This is more a blog post about how to use Fable to switch from X to Y, than it is about X or Y.