Only God can measure all the stuff we desire to measure

That effectively means not everything can be measured.  In which case, you rely on what can be currently measured for your judgments and stay blissfully happy and cover your ignorance with actor-worthy confidence.

Or, you observe meticulously, and add to the current measurements or replace the current measurements with better measurements and move closer to perfect judgments.

I said 'closer'. How 'close'? Alas, you'll never be able to measure.

But if you take time and give space, you might just be able to feel it all and that might be the best measurement.