> Combining quantum mechanics and General Relativity is all well and good, but there‘s one key mystery it doesn’t address: why does time only seem to flow in one direction?

Could the problem just be with us? When time flows backwards, we lose the ability to perceive the events that came after the "current" event. As it flows forward again, we have more time in our context window. We are able to perceive only those events that have occurred before the current event.

Time still flows and ebbs, we just lack the ability to sense it just like a cork in a river doesn't feel the water flowing past.