Hacker News Reader

All this assumes that time is a single thing (sort of gigantic X-axis with "t") that works for everyone in universe equally.

What if we have multiple (billions) of realities with their own t-axis and with us being only one of these with our own timeline?

What if the entire universe with all of its history was just created 1ms ago?

The answer is, if you can't even conceivably test for it, it's mostly irrelevant to think too much about.

It's not an assumption, it's the observed model. Feel free to propose and test other models.