Again, what the fuck are you even talking about if you're not talking about this show? Why even bother responding if you're not gonna talk about the topic at hand? Stop with this whataboutism, dude. Like, you're literally not saying anything worth discussing here.
Because it's bad writing and poor way of conveying information that the audience should have to understand what's actually going on.Why do other elves need to know that villagers are evacuating? How would they even know when the elves that would notify them got captured? Why can't they be responding "off-screen"?
Can you actually tell me what's going on at the watchtower and what the plans are other than them literally starving? No, you wouldn't be able to, because the show hasn't set anything up for the audience to draw any reasonable conclusion.
The way the show is set up so far it's gonna be an Orc raid on the Watchtower, and it's probably going to be a mini Helmsdeep situation. And no one knows if there are going to be reinforcements because nothing in the story has actually set up where and what those reinforcements would be. Galadriel and the Numenoreans are still super far away at this point in time, nowhere near the Southlands. No other reinforcements are established in the show, what other military power is even in the area? Some Elf fortress that they never showed us of?
The reason why this is pointed out is because the show is lacking any proper setup for reinforcements to come, so none should be expected if we're going by the show. Helms Deep in LOTR was a completely different situation since the Riders of Rohan were set up to be cavalry that was roaming the countryside and it made complete sense to have Gandalf to seek them out. That was already set up in the narrative. Here, we have nothing of the sort having been set up. Arondir's story is completely self-contained to the troops at the Watchtower and having no other known reinforcements in the area, and it would be a failing of the narrative if they intend to have a deus ex machina solution to the story involving troops we haven't seen in the area before.