Yes, I fully understand that the Obi is an ATA, and not a phone in and of itself, but that does not alter the fact that bluetooth would be a very nice feature, nonetheless. If car manufacturers followed your logic, then they also would not have adopted bluetooth technologies for phones and upgrades in stereo equipment, for instance. "It's a car, not a mobile jukebox" or "It's a car, not a mobile phone booth" would be equivalently limited visions. Would you say that they "stepped outside the realm of automobiles", or did they listen to will of the people and add features that their customers wanted? Consumers vote with their purchases, and let's face it - people like extras, features, and gadgetry. Let's take smartphones as an even more appropriate and quintessential example. Isn't the integration of e-mail, photos, video, music and apps into one singular device not stepping outside the realm of what a cell phone is? Darn right it is, and this is empirically a good thing.
Perhaps did you not read within my initial post wherein I categorically stated: Yes, I am aware that one could purchase an additional piece of hardware that would provide bluetooth capabilities, but it would be infinitely more elegant to integrate it., so telling me pretty much the same thing in your reply is a wee bit superfluous.
The Obi as an ATA is a very nice device, and if they never make an improvement upon it from a hardware standpoint, it would still go down in history as an innovation, but I guarantee you that if Obi does not do it, someone else will.
Having said that, the limited amount of bandwidth that audio consumes should never be compromised or affected in any way because the link to one's router is Wi-Fi, especially if one is using Wireless-N protocols. Besides, I never suggested eliminating the RJ-45 port, because I know that will often be many users' preference, but adding Wi-fi to it as a viable alternative.
I have movies that are stored as DVD files and they are housed on a computer on my network. I can watch these movies on my laptop which only has wireless-G, and I do so without a single skip or glitch. So, if I can enjoy uncompromised video via Wireless-G, I can safely assure you that something as mundane as audio would be equally unfettered over Wireless-N.