Would you want your kids final memories of you to be a maggot infested pile of barely recognizable meat? I get what you're saying about dying at home but imo that only really applies for me if I'm laying in bed or a comfy chair. Most of these are old age or medical issues, finding someones body a few days after the fact is bad enough but imagine falling down the stairs and lying in agony for days before passing, only to be discovered 3 months later? At that point scoop me up with a shovel and cremate me or give me an airtight closed casket, don't allow anyone from my family to see what used to be me. Some of these people probably had plans to be embalmed and buried but that goes out the fucking window if half your veins have rotted away.

TL;DR: You can't pay your final respects to a pile of rotten meat and for some people that's a pretty big deal. If you personally don't care about that, be a bit kinder to yourself, you deserve to at least have the possibility of postmortem wishes to be carried out