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Gravity shouldn’t be ignored, because if so, a crucial aspect of the system could disappear. Even in kinematics or Newtonian physics, when studying systems, gravity is the first thing we acknowledge: “Consider the force of gravity to be null” or “Use g=10m/s”. Take a ball falling from a building as an example, we can calculate its distance, its velocity, acceleration, as well as any of that information at any given time. We are able to perfectly map out the situation, not only understanding the causes, but also predicting the future. However, if we ignored gravity, we would miss the crucial element of this particular system, the falling. What if, even at atomic levels, gravity is crucial?
If we take Schrödinger’s cat as an example, we can agree that, on one side, yes, human observation will make reality definite, as before the box was opened, the cat was in a state where it was both alive and dead. Although this might be true, one may argue that it was not the observation that defined the state of the cat, but rather the state of the cat was already defined, and we only discovered that fact. We could say the same about human observation in quantum superposition. Observation will show us when an object ‘collapses’ in a certain position, and after a few observations, we could determine the various positions in which this object could be, making it a definite reality. However, that object’s existence is already defined in those positions, and human observation will not change that; we will only acknowledge its situation.
Well, if there was ever one “absolute universal truth”, there wouldn’t be any reasons to disagree and different opinions would simply not exist, as the truth is indisputable. Contradictions are natural, they are based on the fact that no one holds the incontestable truth, and the most we can do is come up with theories that might, or might not be closer to the “truth”, and these theories will get us closer to unraveling all the mysteries. Take string theory, for example, it does not answer all of the questions; there are still mathematical blanks to be filled and experimental proof to be made. However, string theory is a theory that unifies general relativity and quantum mechanics, and by coming up with new theories, the different pieces of the puzzle might one day fit perfectly. For now, it’s impossible to tell whether one theory is the absolute truth, or a dead end, all we can know is that the different contradictions might lead us exactly to the question we need to answer in order to progress.