I disagree with your last sentence here. Your RP entirely decides what V's view on death is. I also said that V's goal eventually does become to just not fade away in the end, and yes he is terrified of that, but of death he is not scared anymore, that's the thing about character development. The entire story is that of survival, and it is very clear that V will do anything to just not fade away. Yet, by the end of the story, V's view on death itself doesn't appear to be so desperate and clingy as it once was.
You can of course just choose to give your body to completely exemplify this as V willingly gives himself away for the happiness of someone. A 'bang' doesn't have to be an impact on the world, but just something enough to ensure that he is remembered in the end- THAT is what he is afraid of. Not death, but fading away and being forgotten by the world. You can see it when he tells Johnny to remember him when heading towards the bridge with Alt. You can see it when he accepts that killing himself is the only way to ensure those that you care about will continue to live on with surprising calmness for someone supposedly scared of death itself.
You can see it when V decides to storm Arasaka alone with Silverhand so that no one he cares for and remember him fondly don't die. Your point on Saburo doesn't go deep enough in my opinion. Yes, V and Jackie killed Saburo, but you soon find out through the side missions and gigs that only a select few people, aka some of those in the merc business, seem to know who you are. The vast majority of people only know that someone poisoned Saburo, nothing more. There is no remembrance here, only another name passing by with you having done nothing to mark yourself in this world, in people's memories.
In the endings where V becomes a legend, if V simply simply had only survival in mind anymore and didn't care anything more than that, it makes no sense for him to seemingly siege the Crystal Palace (solo too). Perhaps there is something he wants there that will help in his survival which could help prove your point, but we honestly don't know. For all we know, this is his final act in the memory of Jackie, knowing that he has made his mark on the world and people will remember him/her as Vincent/Valerie closely, not 'that guy who offed Saburo'
To be scared of death and to be scared of being forgotten can sometimes be mistaken for one thing at times in this game, but fundamentally they are two different things
V and Jackie didnt kill Saburo. His son did in front of them,while they where hidden


