Lack on long range communications (spoilers, maybe)

The prequels added reasonable long range communications (From Kamino to Tatooine is about ~1/8 way across the galaxy). Not that it would have helped.

I'm sure transmitting from the surface of Dagobah was impossible, and by the time he was in orbit, it was probably too late.

Han couldn't contact the rebels on Endor, since that would give away their position and alert the imperials to the rebels incoming assault fleet.

"He's dusted, busted and disgusted, but he's ok"

I'm sure transmitting from the surface of Dagobah was impossible, and by the time he was in orbit, it was probably too late.

Why couldn't he have "use(d) the force, Luke"?

Overanalyzing, I know. But they did have some advanced technology, so not sure why communication wasn't one of them.It's just the way of story-telling. For my part I think there is far too much overanalyzing (on the part of the fan base) of various elements of the entire saga. When we nitpick these films to death you're deliberately destroying the escapism, as well as the tangible magic and spirit of the saga. Not one of the seven episodic films is devoid of reality-based illogic. But starting with 'Star Wars' in 1977 and continuing through seven films to 'The Force Awakens' the saga has its own internal logic which it strictly adheres to.

The following isn't directed at you OP, just in general to the back-seat directors/film-writers: We watch movies to escape and to be entertained, not to sit there like a dumbass and say "oh that's just unrealistic". No $h!t Sherlock it's a sci-fi/fantasy film, it's supposed to be unrealistic. Do you really think you're smarter than anyone else for pointing out the obvious?

So I guess they didn't have long range communication back in the long, long day Nonsense.

The Emperor contacted Darth Vader's super stardestroyer just fine. (Darth Vader then saw fit to move the ship out of the asteroid field, so that he'd be able to teleconference with a clear signal.) In general, perhaps as a plot convenience, the villains are more easily be in long-distance communications with each other.

Luke could have contacted Leia and Han in TESB and alerted them to Vader's presence. He had to get his ship out of the swamp and somewhere where he could transmit a clear signal. By the time he did that, it was too late.

Or Han and Leia could have notified the Rebel fleet they hadn't yet disabled the shield in ROTJ. They probably should have, as there's no reason they couldn't have. They didn't want to risk alerting the Imperial forces, but yet they wound up doing that anyway, so but maybe they also wanted to avoid giving the Imperials a chance to trace the destination of any communications. All that is speaking in the context of the shield generator team not knowing that the Emperor was well aware of their whole plan in addition to the intel about the Rebel fleet congregating around Nien Numb's homeworld.

Anyway...

I've seen people bring up the issue of Leia not signaling ahead to the Yavin IV base just after being rescued from the Darth Star. There isn't an easy explanation for that one. She instead chose to lure the Imperial forces to the hidden Rebel base in the hopes that the Rebels would've found a way to exploit the Death Star before it arrived there to blow them up.
