An awful lot depends on the circumstances the surrounding the loss. Were ships under continuing attack or not? Other dangers in the area?My readings tell me that her crew were gathered on the flight-deck during or shortly after a ceremony for lowering the colors and offloading the Emperor's portrait, a ceremony lasting above half-an-hour, which if true strikes me as terribly dumb.
Even without that, it's very notable that Japanese ship losses throughout the war were occasioned with very high human loss percentages. Hard to say why. Reluctant to pull the plug, perhaps? Poor escape accommodations? High casualties in Allied sinkings seem to result mostly from magazine explosions (HMS Barham and Hood, USS Arizona and Liscome Bay, and so on). But there are so many IJN ships which take 99+% of their crew down as well, but without a massive fireball and flinging of metal. Of course Shokaku had that had that from what sources I've read and watched.
HMS Neptune ran into a minefield in Dec 1941 with just one survivor. She hit 4 mines over a period of some hours before going down. The destroyer Kandahar lost her stern in the same minefield that night and had to be sunk. Cruisers Penelope & Aurora were also damaged on mines. Only 3 other destroyers escaped damage.
Cruiser Gloucester had only 82 survivors from a crew of about 800. Due to continuing air attacks Fiji couldn't stop to pick up survivors.
Ship design also played a part. Smaller vessels with large engineering spaces often sank quickly if torpedoed there. Cruiser Charybdis hit by two 21in TT at night in Oct 1943 sank in 30 minutes with a loss of 426 with 107 survivors, while accompanying destroyers set off in pursuit of the enemy.
And we have the sad story of HMAS Sydney lost with all hands after engaging a German raider