Yeah. This is all just basically me talking nonsense. I'm not educated enough and further discussions would only yield nonsense.

(But if you are curious, the idea is that space is divided into chunks. Crossing chunks or propogating EM/gravitational fields through a chunk causes a delay, which means the particle's inertial frame loses time. And even if particles are traveling at infinite speed inside a chunk, that delay causes an effective speed limit. That's the speed of light. Similarly, there could be other ideas that also "backport" the entire spacetime theory onto quantum.)