Hacker News Reader

The "whatever" part, in strict terms, would be information. Jury is still out whether that is a fundamental component of the universe or not: https://www.pbs.org/wgbh/nova/article/is-information-fundame...

Well, thermodynamics is considered pretty fundamental, and the second law of thermodynamics is pretty much all about information. (But your link already touches that.)

People also interpret the 'unitarity' of quantum mechanics to mean that information is preserved.

This makes no sense at all as soon as you start trying to define where the internal/external line actually is.

I think you're being downvoted because you're announcing it as an absolute truth, of which we do not have evidence.

However I am open to your belief (and not on religious or theistic grounds which I assume many people might think you're talking about) because people have (non-religious) experiences that lend to such possibilities.