seeing as every thread i've come across never mentioned any plans for 4.3 OTA, provide your reference otherwise it didn't happen. The update to 4.4.(presumably 2 due to RHD and communication with Moto) was the only update discussed. Now, if you are really trying to say 4.4.2, 4.4.3, and 4.4.4 in your post, now that makes a bit more sense, and we all are well aware that Google, not Moto, pushed out the .3 and .4 series as RHD was being released. Moto made the promise to push out the security patches from these updates. They did their job. Now for AHD, Moto never released the spring 2014 build to ATT, it wasn't until the fall when a build got pushed out to ATT. This is the furthest we've gotten. ATT has even confirmed that they have the update. You are so dead set in your mind that this is currently a Moto issue, when in fact it is an ATT issue. As reported, ATT will release the OTA KK update, if Moto says AHD will not be updated to OTA LP. Seeing as we are already at our EOL, this scenario is the most likely course of action. If Moto says yes to an OTA LP, then KK gets scrapped and ATT will push out LP when they recieve it.
On the matter of your unofficial modding, you are incorrect on what you say. While some device owners opt to take the route you vividly described, the majority has not ravaged their device in such a hostile way. In fact, there is no glue, just unsnap the back cover, unscrew 2 screws, swap the battery, retighten the screws, and snap the cover back on. Very simple process. Nearly as simple as the pc tech work that is done on a daily basis when you actually have to open up a pc. If this sounds too destructive, time consuming, complicated, then i'm afraid you may be in the wrong career field. The battery only costs between 20-40, your numbers are false advertising and only reflect sellers who want to make a profit. If you can get a replacement battery for free, by all means, i highly encourage you to take that route.