They aren’t immeasurable. The reason you think I’m making a different argument to your point is that you’re asking for every negative proof. This is never going to provide an answer, as it would be a competition to dispel the imagination.
Hypotheses and positive proofs are slowly answering the question of why we’re here. We know that evolution is likely, DNA is irrefutable evidence. We know that it’s likely our known universe began with a singularity because of the background microwave radiation accelerating away from a point of origin. We know the field and corresponding particle that gave matter its properties from the particle acceleration tests by CERN.
It becomes a much different question when one is not only seeking answers that fit their beliefs.