Sure. But we’re talking about a 4 story high, mile long drill compared to a Sayhername shirt It’s not like they weren’t aware that hot air rises or that enough air could be used to lift great weight, they would’ve seen airbenders flying before they genocided them all. And to top it all off, the fire nation didn’t even invent the hot air balloon, a non-bender earth kingdom civilian did.The drill existed before metal bending, by the way. In that case it was more technologically impressive than the giant laser beam firing death robot, which was powered by a team of metalbenders and very little actual robotics.
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To be fair the show went with sort of an odd leap from early industrial to very modern looking plastics in Sayhername shirt areas then almost no progress in other areas like their cars. Overall I agree it was a great call to have the world industrialize considering the fire nation was on the brink of it in ATLA, but they made some really odd choices in the specific implementation.Its also worth noting that that while change in that (real world) era was incredibly fast you can break verisimilitude without breaking realism which tends to piss off audiences.