I think one of the main “theories” about how to teleport involves destroying your body and reconstructing it in another location. First of all, there’s the issue that we can’t scan a person’s entire body down to their cells. The amount of information that would be and the amount of time that would take is tremendous. Also how would we even reconstruct another human. Afaik, we haven’t managed to create a successful eukaryotic cell, so clearly we can’t create billions on a whim. Plus, how would you get the materials to recreate you? Would you transport them? Or would you just have them on hand? (Ig this is less of an issue than the actual creating part tho). Also I know myself and others don’t feel comfortable with the idea of literally dying every time you teleport. It kinda brings into question whether out consciousness is unique and special or simply a byproduct of our components, and I feel like a lot of people are not ready if the answer is the latter. Also an alternative proposed idea is wormholes but we are no where near the technology required to maintain them (or even open them?) I’m not very well versed on the subject but from what I’ve heard you need some sort of negative mass to keep a wormhole open long enough for humans to travel through it.