I disagree with almost all of your assessment. Theonlycarrier that supports the Nexus 4's LTE is T-mobile so it doesn't work on AT&T and then it only works with a single band of the network so it is not nearly comprehensive enough to be a selling point to the majority of customers.
You are correct that LED notifications do tell you information from across the room, which is why I put forth the idea that developers look into makinga faux notification LED hopefully using the contextual core as it handles the Active Display. That said, the Active Display does provide a large benefit over even the enhanced LED apps you talk about to where I struggle to say that it is categorically a worse idea. In addition I don't feel that you can validly say it has the Active Display functionality because the Nexus has an LCD display meaning the Dynamic Notifications app MUST wake up the entire display to show notifications draining the battery. As well in order to be contextually aware like the Moto X it must run the CPU further draining the battery. The Moto X can perform this function while retaining excellent battery life from a small capacity.
The same is said with Open Mic+ attempting to duplicate the Touchless Controls. No other phone can boast having these capabilities because no other phone has the hardware requisite for allowing the features to run without killing the battery life.
Moto Assists main benefit I see is to activate while the owner is driving which I think would also have a detrimental impact on battery life. It is also better in my understanding than its competitors because it lets calls go through if there are multiple calls within a 5 minute interval.
The killer in the Moto X is that its processor power truly does blow the Nexus 4 away. The Nexus 4 does have a quad core processor BUT its cores are only Krait 200s while the Moto X uses the more powerful and efficient Krait 300s. In addition, the Moto X has the contextual processor which means that it can handle all the sensory input that current phones monitor in addition to keeping track of all its new features without having to load down the CPU reducing overall speed or efficiency. You just have to look at the GSMArenas benchmarking scores to see the surprising information that the Moto X is getting double the scores as the Nexus 4 in virtually all tests.
I know that we have said that the benchmarks are not at all valid in showing actual power, but I think that with all the reviews and hands on testimony that the Nexus's components in no way blow the Moto X away like you make it out to be. The Krait 300 and other capabilities make the Moto X an extremely good contender.