If it helps, the Dallas spinoff Knots Landing kept Bobby dead, since they'd have to undo too much of their own continuity to resurrect him. So at that point the two shows became separate continuities; Bobby was alive on Dallas and dead on Knots Landing.
Actually, I loved the season where Bobby was dead. Jack Ewing (a Ewing cousin from Alaska) stepped into Bobby's role as JR's family ally, they got involved with an international cartel, JR and Cally had a marvelous time at a swanky ball in Vienna, Pam went prospecting for emeralds with a cute new guy whose name I don't remember, Jenna went BS!C with grief over Bobby (never liked Jenna), and Ray and Donna learned they were going to have a Downs Syndrome baby and got involved in working with other Downs Syndrome kids. The only thing I didn't like about the season was Jamie getting killed off at the end when she was the accidental victim of a bomb.
And then Pam woke up, went to have a shower, and there was Bobby, saying "Good morning" and in the biggest writing copout ever, whether it's literature or visual media, she says, "I had the strangest dream..."
Yeah, right. She dreamed up everything everyone had done during that year? I once dreamed an episode of Doctor Who, but it was a crossover between Doctor Who (Fourth Doctor) and The Crow: Stairway to Heaven. It wasn't at all compatible with the then-current state of the Whoniverse, since STH wasn't on TV until after the Paul McGann movie and several years before the 2005 reboot. The dream has mostly faded now, but I still remember a couple of scenes and the emotions involved. I may write a fanfic based on this at some point when I'm in the right headspace for it.
So anyway... is a character's sacrifice really a sacrifice if they don't stay dead? It depends somewhat on how they become not-dead. If it's part of the story and adds to the story, if there are actual consequences, it's not as bad as the ones where the "sacrifice" was a huge GOTCHA!
Clara, I'm looking at you, the Doctor Who companion who ate the show. I never looked forward to a companion's death until Clara, because I LOATHE her. I'd actually teared up a bit with the "Let me be brave" speech... but then it turned out to be a huge GOTCHA! of epic proportions, and not in a good way. Clara gained immortality, a TARDIS, and an immortal companion, and didn't learn a damn thing from her experience.
Spock, on the other hand, went through a profound change in perspective, and even emotions. He was still basically himself, but no longer so stiff, and more willing to allow himself an emotional reaction when he considered it to be a logical reaction to an illogical situation.
The only thing I really disliked about STIII was the new Saavik. They took a new and interesting character and made her less interesting than a piece of cardboard. This makes me think that the novelization was based on Kirstie Alley still playing Saavik, since her version was half-Vulcan, half-Romulan and she describes her early life to David - when they're in bed together. Saavik #2 had none of the emotional responses that a half-Vulcan/half-Romulan would experience.
Vegetarian menu, of course.
I didn't care much for STVI, but the emotions involved in the scene with Valeris... fury at her betrayal wasn't only betrayal of Starfleet; he had mentored her, so it felt like a personal betrayal as well. And he was shaken and horrified that he actually mind-raped someone (forced mind meld is essentially a mind-rape)... and it was for nothing, since she didn't have the information he was looking for.
One bit of perspective on the Star Trek movies that may help younger fans realize why older fans don't tend to make a huge fuss about the things discussed here: We didn't have the benefit of the internet and streaming services. VCRs were a relatively new thing, and the only ST movie set I've ever owned were on VHS, purchased as part of my introductory offer for the video branch of Book of the Month Club. There were no DVDs then.
Until much later when sets were released on VHS and there was a video rental store in a neighborhood near you... we had to wait between movies. In this new era of movies and series being streamed and on-demand in a 24/7/365 world, it's easy to forget the days when none of that was possible.
