Here's my take from personal experience:
Ghosting is a totally selfish and self-centered act, it has everything to do with the other person's feelings and nothing to do your own, at all, and don't let anyone tell you otherwise. I'm a Millennial who's dated other Millennials. I've been ghosted a few times, but the worst one was when my ex ghosted me after a 5 year relationship! 5 YEARS. Yes, our relationship was coming to an end at the time that he ghosted me, but we spent 3 incredible years together before that, we shared a lot of experiences and sort of grew up together, and during that time we argued maybe once or twice. We got along wonderfully, we even talked about getting married. Then, after he cheated on me, we began arguing, and after one too many, he just stopped answering my calls. Later, I found out that he was seeing some other guy with MY NAME. Hilarious.
And yes, it was extremely hurtful. Why? Because it's dehumanizing and objectifying. You feel less than human, like a mutant who is too unworthy of any emotional consideration. I can understand if it was just a few dates or a few months, but 5 years is a long time. And he just threw me away like a piece of trash, as if it all really counted for nothing. It seemed like he already fallen out of love with me and just decided to move on without giving me an opportunity to process that. That's what closure is, and why it matters. He just didn't want to deal with the emotional fallout. He didn't want to feel uncomfortable, like the poster above, so he just avoided it all completely.
Honestly, not only is it a cowardly, chicken shit way to go through life, but you are also much less respected by the people you leave behind. If you're in a relationship with an abusive person and you're worried about your safety or the safety of others, by all means ghost him. If you had a relationship with a decent, sane person who invested their own limited time with you in a reciprocal relationship though, you owe it to that person to break it off to their face. Don't be such a pussy.
This all happened a year ago, and it really bent me out of shape. It's very surreal and kinda traumatizing for awhile to just abandon someone who was still in love with you at the time you left. I honestly hope I never see him again. If I do, I would probably beat the shit out of him for treating me like that. Maybe then he'll remember that I'm still a human being with fists, and not a ghost. So if you want to leave bad blood behind and burn bridges, ghosting is a great way to achieve that! Just make sure that you'll never have to deal with that person ever again.