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Amadameus ago

Declaring that quantum uncertainty means 'reality is subjective' is exactly what the Wikipedia page meant by 'endless speculations.'

Relativity and quantum effects may be strange and counterintuitive to macro-based reality, but that doesn't mean reality is subjective by any stretch of the imagination.

For example - by constructing specific situations and moving at significant percentages of lightspeed, it's possible for two observers to record a very different reality than others. They might disagree about the times of certain events, or they might even disagree about whether events A and B occurred before or after each other! But they will never disagree about the universe's causality. No amount of relativistic motion or gravitational lensing will make the statement "Event A was caused by B" appear false, to any observers.

Just because these things are bizarre and strange doesn't mean they're an explanation for anything.