Yeah but the pressure equalization happens so fast you’d almost certainly feel nothing.

Hmm, but human body is mostly solids and liquids, not very compressible. Their lungs and airways, sure, would be compressed to nothing, but what of the rest of their bodies?

Eg I'd imagine the poor souls on the Titanic next door are not crushed by the pressure, for the same reason.

Or with scuba diving, deep scuba is complicated and dangerous for many reasons, but the pressure compressing the body is not one of them.

i'd assume the air forced into various cavities (especially the skull) would send shock waves into neighbouring tissue ripping everything apart upon surge of pressure. also probably lots of turbulence creating shearing forces also ripping everything apart. so, everybody ripped apart. titanic victims sank slowly allowing for continuous evacuation of cavities. air streaming out and water in.

Think about why a parachute works. It’s the same concept.