u/Airworthy7E7

Coherent matter requires ongoing interactions between its constituents. Those interactions require causal contact. The instant any particle crosses the horizon, its future light cone points exclusively inward and it can't interact with any other particles anymore.

I'm not arguing a violent energy deposition, JUST geometric. 'Outward' stops being a direction, so the interactions that enforce composite structure have no future that includes anything else, I would think.

Is this already formalized somewhere? Where does my argument break down?