You know how in movies/tv, there’s this cliche that people would somehow “feel bad” after someone kills themself. Like:
parents somehow crying and be like: “why didn’t you just talked to us, we loved you so much!”
sibling be like: “maybe I should’ve been a better sibling”
or school bullies be like: “oh yea what we did was kinda fucked up, I feel so guilty”
or some bullshit.
I have a feeling that, IRL, nobody would care
like really, who the fuck wrote those cliche “people suddenly appreciate you after your death” tropes? like those directors really wanna make me kms lol?

I am not quite qualified to answer your question. My simplest guess is that those tropes make money because they trigger something in people, affect dopamine production or whatever and in turn make more money? Idk.
Anyway, your post made me think of a Japanese girl (one of the two girls who made the duet Namakopuri that made some soundtracks for the game Cyberpunk 2077. After “disbanding”, she continued to use the duet’s YouTube channel, on which she later announced that she is doing a 生前葬 (for non hanzi/kanji readers: “a pre-death funeral”). To concept was so crazy for me at first. But just like some others commented on your post, maybe it’s about creating good memories with people that matter to you. In that sense, I understand why a pre-death funeral could be nice: you decide how to do it, who to invite, etc.