What features do magical caves in the arctic, inhabited by nature people that don't built or do any sort of construction or manufacturing have?

"Why they naturally have doors!"

Of course they do!

Really?

Shut up! We're trying to keep coming up with big dramatic moments to keep the buzz up on this show. Hodor sounds like "HOld the DOoR" so that's going to be the magic backstory we're giving him to make his death more tragically dramatic!

Won't people see right through that?

"Oh please, we also had a scene where a new king orders an entire country to begin unskilled labor on a massive fleet of warships intending for them to actually matter in the current fight. Twice in two episodes, we have had characters sway, or nearly sway, an audience of pragmatic barbarians with bullshit reasons, which is in complete contradiction to how those people were portrayed in the first two seasons. People watching this show will believe anything."

Yeah, wait until you see how we're going to butcher the plausibility of the wildling-Karstark wedding in the upcoming episodes!

Ooh, look. They made a Shannara TV show! And Legend of the Seeker is on Netflix! At least no one pretends those are supposed to be smart. Even if they do just as good a job at making an unimpressive book writer seem better by comparison.