Actually this episode the scorpions were more realistic than the last episode where they hit the dragon right away, first shot, then second shot, boom, dragon down. It is really hard to hit a flying object with a heavy weapon that is really slow to be turned. I'd say it's almost impossible. But still, the episode before this, they just did it twice in a row for plot reasons.

Of course Daenerys turning into the mad queen is not implausible, but the way it was written was stupid. It almost felt like a fan-fiction parody of GoT at some points.
I mean, who was it that Daenerys hated most? It was Cersei, definitely. But instead of going straight for her, she decides to almost let her get away and instead burn the whole city full of women and children. I would have loved it if she went for Cersei with rage and by accident burnt the whole city. But no, she totally forgets about Cersei and burns all the innocent women and children in the streets? Methodically eradicated them. That was just weird and unbelievable.

"No crew? Gotta work fast? 4K? Gotta look inconspicuous? Gotta Travel?"
Believe it or not, I would actually pick a Sony PXW-Z90 for that kind of work rather than a dslr with a bag full of photo lenses and a seperate audio recorder.
Sure you can get some nicer bokehlicious shots with the APSC sensor and an F1.4 lens, but those shots won't make your film, and you'll be missing a lot while changing lenses and fighting with your screwed together setup of camera and audio recorder.

When I was watching it, I was thinking to myself "well, this looks rather clean and digital - maybe the film buffs are right and film actually DOES look better". And then the credits rolled and I couldn't believe my eyes that it was shot on film.
I have to admit though that I only watched it on a 55" tv and not on a cinema screen. But still, it was weird.

The host of what? Is this relevant somehow? Should I know about it?

You are absolutely right - you can deliver better work with adequate tools.

It's like saying you could build a wooden house with just a hammer, and a simple screwdriver. Sure yes, you could. But why not get some modern power tools that will make you work faster and better.
But no matter what tools you are using, it's kind of implied that you know how to build a house.
Same thing with movies. You have to know what you are doing or the best tools are worth nothing. But when you know what you're doing, your talent might be wasted if you are using horrible tools.