Another great one, @triptolemus! Thanks for that :-)

I'm pretty sure we've all been caught in the trap of over-concept-developing once.

We often see that happening in politics when decision makers communicate that they've set up a board, committee or task force. That's the moment when you know that they're actually not operating at all. They're just sitting around and losing themselves in theory.

Effectively wanting to generate an output definitely requires taking action as you perfectly explained.

It's anything that leverages the knowledge and creativity of your inputs and then outputs it as some sort of manifestation in the world.

Exactly, an output generates an impact. Planning and concept development don't. There lies the difference :-)

Also great tip on journaling, I had never thought about it but may take it into consideration.
And to answer your question: My favourite medium is definitely writing.

Loved and resteemed