It's really telling how it's much easier to progress when things that you are working on are directly measurable rather than self-reported or estimated through

It's really telling how it's much easier to progress when things that you are working on are directly measurable rather than self-reported or estimated through proxies. Also progress in any science is contingent on progress in technology. There's only so much you can figure out before you'll need new, more precise way of measuring things to go on any further.