Elvish blades glowing blue in the presence of Orcs/Goblins/evil - was there some rationale for this being basically abandoned in the new films?

So as we know, the characteristic of elf-forged blades glowing blue when orcs (and some other creatures) are near is a pretty well-documented phenomenon in the books and is clearly covered in the movies, both LOTR and The Hobbit 1-3. After viewing The Hobbit (part 2) with a friend it was pointed out to be that this rule wasn't adhered to in some cases, so I payed closer attention when watching part 3 recently and noticed that it's all but thrown out for almost the whole movie.

I did discover through researching that only ancient Elven blades have this characteristic, which explains why the entire Elf army didn't have blue blades, but it is explicitly stated in both the books and part 1 that Orcrist, Glamdring, and Sting all meet this requirement. In the newest movie I noticed Sting glowing once, near the end, but for the rest of the film I saw the quality absent from Orcrist and Glamdring. This was particularly noticeable during Thorin's fight with Azog, where the blade never glows at all, even when embedded inside a still-living Azog.

Is there some rationale for this within the fiction? It seems like kind of an obvious thing for the effects department to add.