The blog post deals with the inaccuracies with military history and the adaption from the Books but I guess the main thing I would only take issue with is whether there's a justification for the change in the adaption. Having listened to the Extended Edition commentaries, I'm fairly certain that a fair number of the production cast did in fact read much if not all of the Tolkien stuff but the adaption probably fell short of being completely faithful in some respects various obvious reasons.
One of them, especially when concerning medieval armor being considered useless or forging blades by pouring them into molds just seem to be Hollywood brainbugs. Armor is basically useless in almost every Hollywood adaption, even really good ones with the exception of maybe the 1981 film
Excalibur. I maybe misremembering there however.
And the pouring of molten fluids into mouldings was a thing that occurred in the
Game of Thrones and perhaps more forgivably the classic Sam Milius
Conan the Barbarian movie and even more ironically perhaps, in those two settings it was done to make "super swords" not just mass produced Orc blades.
I'm forgiving of brain bugs not because they shouldn't be corrected (they should be corrected) but it seems to be a standard in film productions in general so... fine. I won't single anyone out in that case.
The next one is in regards to curved swords and plate armor instead of using the more faithful mail armor and things like that. I'm not opposed to it because cinematically, it looks good. I even like the Uruks being born in mud thing since it fits the theme of Saruman consuming the old world in the fires of industry and even evokes the (unconfirmed AFAIK) metaphors of Tolkien's military service in World War One, serving in the mud and all that jazz like a filthy Orc.
When it comes to making film adaptions of beloved material, I actually don't want to see complete 1 for 1 adaptions. I don't mind seeing creative and artistic license taken as well as practical ones as long as it remains strongly faithful to the lore its adapting. It's akin to a War Movie IMHO.
We Were Soldiers didn't end with an American bayonet charge.
Black Hawk Down didn't have Somali Machine Gun technicals running around and one of the choppers crashed into an alleyway, not an open square. Both are amazingly gritty and realistic and yes... generally faithful films. A lot of the military veterans in those operations seemed to like them unless they had sticks up their butt. And I don't wanna be one of those types.
But there's still a fine line with both... wouldn't the films of been way better IF there were more shieldwalls at Osgiliath? Wouldn't the film of been better with Orcs pulling down Gondorians with superior numbers and bashing them to death in their tin can armor with maces? Wouldn't the Charge of the Rohirrim been more impactful if Mordor's army was still stuck outside of the City Walls and swept from the field?
Also you would've never had to have the Scrubbing Bubbles Army of the Dead to basically show up and save everyone ten minutes later with one toilet flush. And you still could've had the lore inaccurate but incredibly cool megafauna elephants stomping on people.
Basically there's a very blurry line with everyone when it comes to nitpicking and legitimate criticism.