I have already read this post about Relativity of Simultaneity but it doesn't seem to answer my question or it confuses me even more.
Please feel free to close this if I am mistaken.
I (think I) understand Einstein's thought experiment about the 2 lightings striking at "the same time" for one observer standing still but not for another one who is moving towards one of the light sources.
But it's only the simultaneity in regards to the observer's perception of the light emitted by the event and not the event itself that is in question.
The event itself: 2 lightings striking the ground, does happen at the same time for both observers, but it's only about their individual perception of both beams of light reaching their eyes that they cannot agree on right?
In other words, observing events and deciding whether they are simultaneous could indeed be relative in certain scenarios but events themselves, by themselves, in themselves, a priori can be simultaneous in an absolute manner no?
I mean if absolute simultaneity of events, independent of human observance doesn't exist then Alpha Centauri doesn't exist and the rest of the universe surrounding us doesn't exist right?
Because for things to exist there needs to be a continuity of existence, and if there is a continuity of existence then it must be simultaneous to/overlapping with the continuity of "our" (e.g. that of the planet earth) existence.
In other words, if the Milky Way is "happening right now" but we're not allowed to say that Alpha Centauri is "happening right now" as well, at the same time, then that would mean that Alpha Centauri doesn't exist or worse the rest of the universe itself.
And if Physics is indeed interested in events in themselves, independent of our observation, why does it care about the relative character of observable simultaneity?
I am a philosopher who is a Physics enthusiast with a high-school level knowledge of Math if that wasn't already obvious in an absolute manner.