That's different, though. We're never made to believe Anakin/Vader might have died. Not once. It's clear from the start that he survives.
That's fundamentally not the same as a character everyone thought had their death, and then years later some writer goes PSYCH I'm back bitches never even died actually.
That's not, like, an inherently bad way of writing things, but it certainly has demonstrated historically that it comes with a greater likelihood for bad writing. Not surprising - it's an indicator that writers may have run out of ideas, and are reusing ones from the past. Sometimes it's done well; usually it's done poorly.
And there's also the problem of diminishing returns. Bringing a believed-to-be-dead character back one time, okay. But now we're in this weird space where nobody important ever seems to die, and even if they do, nobody believes it. Getting stabbed through the stomach/chest with little to no consequences is an entire meme in SW now, because they've overused it. "It's just a flesh wound" and all that.