Yeah, it was like in December 2017 when Last Jedi came out, everyone and his dog complained about Luke Skywalker dying at the end! Big deal! Obi-Wan Kenobi was killed by Darth Vader in Episode 4 and still came back in ESB and ROTJ.
And remember in 2015 when Force Awakens came out, everyone complained about Han Solo's death, it was part of the story for God sake!
And the late Carrie Fisher will still be in Episode 9 even though she passed away just after Force Awakens came out as I recall, yes she's physically in it, not a CGI image of her.
When Obi Wan died in Episode 4, that was the very first film in the franchise to be released and the film in which he was introduced, so we'd never seen him previously and as such, his death was sad but not major - especially when he came back in the sequels as a 'force ghost'.
The reason people complained about Luke and Han dying in those situations is because Luke and Han were characters that Star Wars fans had gotten to know for
decades; not just in the movies but in the novels, comics, games, etc that followed. They were given time and stories to develop and for people to grow to admire/love them.
As such, it was much more of an emotional impact when they came back, only to be killed off quite disrespectfully; Han Solo getting stabbed by his son during a conversation and Luke dying after sending a 'force projection' to fight Kylo - with many (myself included) pointing out that if Luke was going to die then why didn't the filmmakers just make him physically show up, have an epic battle with Kylo and maybe with the Walkers and die at the end of that?
(Granted, Luke apparently may not be dead as he may appear alive in Episode 9 but that's yet to be seen).
You personally may not think it, but for a lot of people the characters they see in books, comics, tv shows, video games and movies aren't just characters in a work of fiction - they're living, breathing people who we grow to admire and emotionally connect with; especially when we get to know them for a long time. We get to know their personalities, their loves and hates, their goals and fears, what makes them tick, etc.
It's because of this why we get upset when they fail/die, we cheer when they succeed, we remain interested when we watch them grow and develop, we sympathize with them when they have to go through difficult times, etc.
It's also because of this that we get angry when someone who doesn't understand the characters makes them do something that they wouldn't do because of how 'out of character' it is. It's one of the reasons fans got so upset regarding Luke in the new trilogy, as in the original films Luke tried and succeeded to turn one of the most evil men in the Star Wars franchise - who had slaughtered millions of men, women and children, devastated civilizations and destroyed planets - because he
believed that there was good in him.
However, in the new trilogy Luke goes very much out of character and tries to kill his nephew - who currently has done nothing or barely anything evil -
because Luke had a bad dream. That's not Star Wars fans been 'butt-hurt' and/or 'Disney-haters', that's Star Wars fans rightfully criticizing bad writing.
To put it into perspective, many people get upset in this scene from
The Lion King.
I'm one of them; it's a sad scene and it tugs my heartstrings. However, most people will still keep watching to the end and will be satisfied as there's a happy ending.
However, now rewind back to the 80's and the Transformers Movie. This had followed after
2 seasons and
55 episodes of the Transformers TV Series, during which the children had watched it had
really gotten to know the characters and grown to love them; watching the episodes, reading the comics, buying the toys, etc. with Optimus Prime becoming one of (if not the most) popular character on the show. It's important to note that throughout those two seasons, no character had ever been killed off.
When the movie came out, however, we then got this...
which was then followed by this...
For most kids, this is where they stopped watching - with plenty of reports of parents having to carry their hysterical children out of the cinemas because they were crying and bawling so much.
Not only did Hasbro receive a backlash from hundreds of angry parents regarding this, but it was reported that many kids were so traumatized by Prime's death that they put away their toys and didn't play with them again, with one report of one kid in particular who locked himself in his room for
2 weeks!
The backlash against Hasbro - who had killed off Prime and other characters in the film in order to replace them with new toys - was so bad that not only did they eventually bring Optimus back in the TV series, but they also had to edit their 1987
G.I.Joe animated movie (in which they had planned to kill off the main character Duke) to have the characters claim that Duke had 'gone into a coma'.
On top of that, they had to put a voiceover at the end of the movie for its UK release to tell any kids who were still watching to the end that Optimus would return.