There was a child post of this which was deleted, but I thought was very on the mark. (It was likely deleted because it said things about a certain BigCO internals that potentially weren't public)
That being said, I'd like to independently re-echo the thrust of that post because I did feel the contribution was key:
There are often internal channels in large companies that the boots on the ground use to communicate with each other in a more informal fashion. I've noticed across multiple companies that this is a FANTASTIC leading indicator for the success of a feature. For however much flak engineers get for not being "people persons" or however you put it, or needing "Designers" to guide their customer facing work, I've seen significant correlation between popular sentiment and feature success. Perhaps at the end of the day, enough of our outlook as "consumers" remains to properly instruct us despite whatever programmer bent we may have; or more pessimistically, our own sentiment on what we're making subconsciously impacts our output in a meaningful way.
So to end this ramble briefly; I think we CAN tell, the powers that be just need to look in the right places, and listen well if they do.