I agree, it's just like wanting a console without a disc drive. There is even a thread about that here. However, I want to make two points about that comparison, because it's a good one:
1. I don't believe that in the thread, I ever told the person not to buy a console if he doesn't like the drive, even though I disagree that it should be optional. I didn't tell the guy to go away and stop discussing things because his preference isn't reality. I simply replied with my opinion about how losing the drive would alter the effectiveness of the console. I discussed the opposing view on the usefulness of the drive, while many here decide to take the "if you don't like it, then get out," route.
2. Again, I think that the comparison is a good one. There are some differences, though. If you take away the inclusion of the Kinect, it does not take away the ability to purchase it as an accessory and use it. If you take out the disc drive and make everything all-digital, it is different because the disc drive is not a standalone accessory that you can purchase if you want it. If there was a direct comparison to where they would lower the price of the Xbox and make the disc drive an optional accessory, I wouldn't even have a problem with that. It's pretty much the biggest benefit of PCs--you can pick and choose what you want. I know that the level of flexibility involved there is part of what makes PC gaming unattractive though, and the simplicity of the single-build nature of a console is a plus. I would support making the concept of lowering the Xbox One's price to make the drive an optional accessory, though I would have to think that there would be an option to have it pre-installed via Microsoft, if you want it, because some people cannot handle such a task.
There is also one glaring difference between the comparison that I should point out, particularly because I have brought it up before: Familiarity. The disc drive has been the primary form of delivering home console media since, what, 1994 (it released in Japan in '94, '95 for the rest of the world)? Expecting an immediate switch is a bit unreasonable, and that's what I've tried to point out with the Kinect. Prove that it is desirable and capable before you make it a required part of the system. I believe that we're only one (MAYBE two) generations from a no-disc console experience. It might even be that the likely hardware refresh we see with this upcoming generation includes an Xbox One with no disc drive. I've stated that I don't necessarily have an issue with requiring a Kinect purchase with a console, but it should be proven as a premium technology beforehand. Imagine if the first Kinect was a required product for Xbox 360 consumers, and that the original Xbox released at $500 for the 20GB model. The first Kinect was, and is, a sub-par technology for most people. I think that there would have been a big problem with having people find out that they had a $100 accessory thrust upon them, but it's no good. That's my fear with the Xbox One, that the new Kinect refresh isn't proven as a big-enough upgrade from the first to warrant system integration just yet.
But yes, back to the PB&J analogy. I get that the two are intertwined. That does not make me like it, though I might tolerate it (under the right circumstances). That also does not mean that I can't voice a dissenting opinion without having my intelligence insulted and being told to leave for 6 months, once I have a firm decision made on a purchase.
Oh, and since that analogy is out there: Peanut butter is great. Jelly is great. Peanut butter and jelly sandwiches are great. Very few (and no one I've spoken to) like that nasty jar of crap where they put the two together pre-sandwich. Just because two things work well together doesn't mean that they should be inseparable.