I just think that all that something for nothing magic: time travel, teleportation, replicators, holosuites and faster than light travel all at the flick of a switch and virtually no power source or machinery is just bunk. People can and have written science fiction which doesn't use magic.
Yes, they have, but they have also written science fiction that does use such fanciful ideas. "Science fiction" is an inclusive label, not an exclusive one. It's not about being an elitist snob and saying that certain types of storytelling aren't allowed to eat at the same lunch counter. SF is the literature of ideas. It's about exploring possibilities, not rejecting them. It's about exploring the consequences of hypothetical science on human existence, but having the science be plausible is optional, not mandatory. Because the effect on humanity, the effect on the characters, the ideas and adventures and philosophical conundrums that arise from the science, are more important than the technical details of the science itself.
Nobody's claiming that time travel and FTL and transporters are likely to happen. That's not the point. The point is to tell stories. Yes, there is a subgenre of SF that grounds its conjectures in plausible science and technology, and that kind of "hard" SF often inspires real scientific innovation just as much as it's inspired by it. But that's just one of the many approaches that exist to speculative fiction, and it coexists alongside the others rather than being at war with them. And sometimes those more fanciful speculations can inspire real science as well. People used to assume FTL drive was total fantasy, but
Star Trek's warp drive inspired physicist Miguel Alcubierre to devise a "warp" solution to the equations of general relativity, and his work has inspired a whole new branch of theoretical physics which, while it's unlikely to bring about actual FTL propulsion, has provided a new avenue for gaining insights into general relativity. And I'm sure that the theorists behind quantum teleportation, which has many practical applications in computer science, were inspired to some degree by ST transporters,
The Fly, and the like. Just because a fictional idea is fanciful doesn't mean it can't inspire worthwhile thought in the reader, whether that thought is scientific, philosophical, or character-oriented.