One is easily amused in conversations for a variety of reasons. It's the nature of interpersonal communication!
I totally respect personal preference, yet it was an irony too irresistible to point out that the dev considered "twirly-whirlies" "a bit silly," but chose to keep in other "silly" elements from the films. No biggie. Yet consistency would be cool. Might as well make Alfrid Lickspittle a temporary summon for the Master of Laketown, now; or include Radagast's jack rabbit sleight as his steed! (Btw, just kidding, devs! Consistency isn't always a good thing...) The twirly-whirly thing was ultimately kind of a joke on my part to throw into the forums to see how far I could run with it. Worked like a charm!
Anyways, I think the windlances were an interesting development by the filmmakers to further accentuate the danger of the dragon Smaug. I listened to the commentaries on this specific subject, as I, too, at one point did not prefer the change from an arrow to what functions more like a spear. Basically, the reason the filmmakers gave was something along the lines of how difficult it would be for general audiences to buy the idea that a massive dragon like that could be taken down by such a small arrow; and that said arrow would be very tricky to appear at all onscreen, especially in a dramatic way. We even see the filmmakers showing this in how many times Bard attempts to shoot the dragon with normal arrows, only for them to be very hard to see, and then lacking in screen drama. I guess, ultimately, I could see the argument on either end of the spectrum. While I don't necessarily like the execution of the slaying of the dragon in the films, I do admire their efforts to raise the drama by showing him attempting something that by all means should be impossible. It stays true to the spirit of Bard the Dragon-slayer for still being able to achieve the impossible. Not the best way to go about it, but it works to some degree, at least in concept.
And if anyone would know how dangerous a drake is, it would be the Dwarves, given their past with them. If something as massive as those spear-like Black Arrows won't take down a flying beast of hell, not sure exactly what would! For my money, that's good drama. And that it adds to the lore is just a cherry on top. I can admire the filmmakers' imagination to try something a little different, yet not wholly unbelievable. The windlance looks like something very practical and something that could reasonably work.
In the end, the windlances are an interesting concept in that they develop the state of the world of men in the North and their old alliance with the Dwarves of Erebor. It gives special notice to the dangers of the North and how they tried to protect themselves against them; and the way I see it, it's all too reasonable they would at least try to further develop the windlances to protect future generations from another beast like Smaug.
Incidentally, I just recently noticed the amazing new art assets for Laketown/Esgaroth. Great work! And of course I noticed the windlance perched atop the tower! Not sure if the devs mean it as just a prop with no function, to stay true to the visuals of Laketown presented in the films, or if they mean to make it a useable device with more down the line. Exciting stuff to see it, regardless!