Game of Thrones final season [spoilers]

[Homeless Nutter]

However, a much smarter option, from the tactical point of view - in my humble opinion - though much more costly to shoot, would have been to keep the Dothraki in the wings, wait for the undead horde to attack first, and then attack their flanks, while the enemy is stopped by burning pits and spikes, all the while pelting them with burning projectiles and dragon fire.

Like a Ramsay Bolton, Battle of the Bastards move.  Only problem is that since they're fighting at night and can see fuck-all they don't know when to attack flanks in order to encircle the dead.

Encircling the Nightking's army wouldn't be the idea. There would probably be too many of the undead and not enough Dothraki. And without long weapons and a wall of shields they couldn't enclose, or push the ice-zombies, anyway. But the main strength of light cavalry is mobility - quick attacks and retreats, which would have been easier from the sides of the attacking army approaching the castle. And while visibility was an issue, it seems to me, that once the undead reached the defense lines and were stopped by the fire-trench - that could have been a good time to charge their flanks. Better than a head on charge at the enemy you can't see at all, I think.

Well, have we considered the possibility, that Jon and Daenerys... are simply idiots?

Definitely possible but IMO less likely.  Jon had made statements like that you can't fight the NK's army in a straight battle and had seen how they fight at Hardhome so he knew a lot more of what to expect than others like Greyworm who would line up the unsullied and fight that straight battle... but ultimately Jon does exactly what he says not to do.  I would have bought a battle that had a clever defense strategy that just falls apart but the way it was portrayed it wasn't even a clever strategy.

That's kind of my point - the main characters of Game Of Thrones are just not that clever. And they've proven it over and over - especially since the book material ran out. I think it helps to look at that world as a kind of "Idiocracy", where people's intelligence is severely impaired, due to millennia-long over-reliance on dragons, magic and gods...

The plan was that Davos would signal Dany and she would swoop in and her dragon would light the trenches but all the storm clouds and smoke blocked her view of the signal.  Davos commented on this in episode.

Sure, but I thought Dany was supposed to be focused on the Nightking and only ditched that plan and joined the battle, after she saw the Dothraki wiped out in seconds. She might not have been able to see Davos, or reach the trench in time anyway, if she was fighting the undead dragon. They  could have prepared a simpler, more fool-proof way to do it, in my opinion.

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You do remember that white walkers can snuff out fire

That's beside the point. They needed to set the trench on fire and it looked like they would have completely failed, if the Red Woman hadn't shown up, out of the blue. Bad planning.

and there is nothing stopping him from using his dragon to simply stomp the flames out .

Jon, Daenerys and their dragons were supposed to stop him. They were waiting for the Nightking to show up, that's why they were not on the battlefield at the start of the battle.

I don't really know how the trench was meant to work - it looked like it was very flammable, but maybe that was just Melissandre's magic. But if the trench was not filled with some kind of highly flammable material - then why did Davos shout at his men to light the trench, after he couldn't signal Daenerys and why did they run towards it with torches, only to be killed, if it was just a bunch of wood that was meant to be lit with magical dragon fire?  

They are? LOL. Well, then someone should have told Theon and the Ironborn guarding Bran, because they were using bows - quite successfully - against wights, until they ran out of arrows

1. Because they using dragon glass which not everyone had access to 

Really? Then why were they lighting their arrows on fire? Seems like a waste of time, since dragon-glass arrow should kill the undead without it. And what do you mean - not everyone had access to dragon-glass? Didn't they go to Dragonstone specifically for that?

Also - since the Dothraki didn't have dragon-glass swords - what were they supposed to accomplish, if Melissandre didn't happen to show up unannounced, literally minutes before the charge, with her - not very useful - fire-sword magic?

2. They weren't up against a horde  

What does that matter? Either arrows work against the dead, or not. And clearly fire arrows seem to do the job. So why not shoot at them, while they're standing behind the burning trench?

3. If the used arrows the night king would just use his dragon an torch them so it would have done shit .

Again - the Nightking and his dragon were supposed to be busy fighting against Daenerys and Jon on dragons.