We see a length contraction, but that aside, I've always thought of this question as super interesting. From the POV of the photon for example, the universe is

We see a length contraction, but that aside, I've always thought of this question as super interesting. From the POV of the photon for example, the universe is basically flat. A 2d timeless plane. From this POV, the double-slit experimental results seem much more clear, it's more intuitive that the photon can both interfere with itself and appear in just one spot, as it experiences both the number of slits and hits the screen simultaneously. From the photon's POV, there's no 'delayed choice quantum eraser'. I believe the main issue with this line of reasoning, that length/time contraction are instrumental to entanglement is that entanglement phenomena like the double-slit also works with larger particles that are not necessarily travelling near the speed of light.