[Spoilers] It just doesn't add up

I've just finished the series and have my expected gripes but here are the things that just straight up don't make sense to me:

1. The Ironborne Fleet: Euron Rallied the Iron Islands to create an entire fleet from scratch in what, 2 years? I'm no expert but it doesn't seem reasonable to me that that many ships could be made by that amount of people in so little time. These are decorated ships with beautiful regalia.
2. The Unsullied and Dothraki Armies: Danaerys wages the Great War with her sub 8,000 Unsullied and few thousand Dothraki. The Dothraki suicide charge into the dead and die within minutes. Scraps come back. They're gone. The rest of the episode is an absolute slaughter of the living, with the open areas of Winterfell void of any life, and a few characters sneaking around the fort trying not to die. My takeaway from this episode was that though Danaerys prevailed, at least 90% of her army was absolutely shredded. Cut to episode 6 where we see her army displayed at the beginning and end. It appears large as ever. Am I missing something?
3. The Northern Wall: The undead dragon utterly decimated this thing, it was literally gone. Why is it completely "repaired" at the end of the season? That would take literal decades.

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If I've missed something obvious, please inform me

Submitted October 17, 2021 at 12:18AM by MGMGrandDtr https://ift.tt/3FTsgh6