I think a big part of the problem is we look at and model time backward. It isn't the point of the present moving from past to future, which physics codifies as

I think a big part of the problem is we look at and model time backward. It isn't the point of the present moving from past to future, which physics codifies as measures of duration, but change turning future to past. Tomorrow becomes yesterday because the earth turns. So the present is a constant state of collapsing probabilities. Duration is just the state of the present, as events form and dissolve. This makes time an effect of action, more like temperature, color, pressure, etc. Thermodynamic cycles are more fundamental than the linear, narrative effect of time. As high pressure is causation, while low pressure is direction. Time is not causal. Yesterday doesn't cause today. Energy is causal. Sunlight on a spinning planet creates the effect of days. As energy is conserved as the present, the past is consumed by the present, as much as the inertia of this energy directs present events. Time is asymmetric because action is inertial. The earth turns one direction, not the other. Clocks run at different rates because they are separate actions, not because the fabric of spacetime is curved. A faster clock will simply expend energy quicker. That's why the twin in the faster frame ages quicker.