For example, you decide that you want to die at 85. And, further, you decide the week, the day, the hour, the minute...even second, who knows?
And you have a big funeral where you invite everyone you want to come, assuming they'd still be around, and also if other things are permitting.
You go through life casually inviting people to your funeral.
You plan it out...make a playlist, put a bar in serving drinks of your choosing.
You invite guest speakers...maybe record something you'd like to say, maybe read chapters of books of your choosing etc etc etc.
Basically you go out on your own terms.
Assuming you make it that far (but you could correct for individuals based on genes and health and whatever other factors).
And you set the date. You know exactly when your time is up. No guessing, no nothing...just the anticipation, and perhaps paranoia that it might not happen the way you planned...but hey, then again, does it ever happen the way anyone planed? That's just life...
(It's like extended suicide by natural causes.)
Would it be a bad thing? Or a good thing?