You can only say this thanks to the work of generations of previous scientists (and teachers) who managed to render the very unintuitive as intuitive.

> Realms where our senses do not operate would be microscopic or relativistic and the like

There are (a) dozens of known cognitive biases, the majority of which we cannot avoid even when we know about them (b) visual and auditory illusions. Both of these are not in the microscopic or relativistic realms, but nevertheless show clear examples of our senses (and upstream sensory processing) failing to properly inform us about the state of the world.

> National economies are completely observable and accessible to our logic and common sense.

A national economy is only "completely observable" when reduced to statistics. No individual can possibly "observe" all of a national economy, partly because it is too big and partly because parts of it are too small. A statistical summary is not without value, but is not equivalent to it being "completely observable". As for the notion that we can bring our "logic and common sense" to bear on a national economy: well, that's precisely what the arguments between orthodox and heterodox economists is all about. They are bringing their logic and common sense to bear on it, and they do not arrive at the same conclusions.

> gives up so quick on picking winners in macroeconomics theories

On the contrary, I am very much for picking winners. While the answer may not be forever (subject to new theories), I pick MMT for a winner over orthodox/mainstream theories. This is not because I am certain that MMT is correct, but more because orthodox/mainstream theories have all the hallmarks of having been invented by the winners in an economy, for the winners.