my personal opinion is that instant (i.e. arbitrarily close to speed of light) teleportation machines could be built in theory, but doing so is really expensive and there's just no economical reason to do so.

for example, for fast travel, we already have aircraft and rockets. Yet nobody would use them to ship objects produced in china to europe, e.g. cars, if there's no time-critical component (i.e. food that spoils very quickly etc.). So the fastest way of travel is typically also the most expensive one, while cheaper modes of transport take more time.

Then, you can think of a teleportation device as a mode of transport where the speed approaches the speed of light. If our previous experience is anything to go by, that means that the cost of transport would increase enormously, and thus practically nobody would use it anyways. So that's the practical side to this thing.

More like brainuppercut. Goddamn. Thankyou.

Ok, then explain Thomas Riker