If you want to pick at different categories here, and inconsistencies within categories, you can do that all over the place. (As I sometimes do myself)
That said, computers, as a category, are not a high priority at EB. I suspect that's why this category isn't listed in much of the site navigation.
Think about this way: nobody is going to come to EB and decide what type of computer to buy based on something they read here... but they might decide to buy a guitar pedal or synth based on what they see on EB.
People do not make purchase decisions rationally, especially when it comes to what kind of computer they choose. In my personal experience, emotion, self-perception and the desire to be seen a certain way socially are much bigger drivers.
Just because one kind of computer is cheaper and more powerful, or one is used more in one kind of industry than another, that doesn't mean the people who choose that kind of computer are any less emotional or somehow more rational.
But as far as why the computer category has such a strange ranking, it's just not a high priority, from what I've seen. Like you said, you can make the same kind of music on pretty much any kind of computer these days, nobody cares.
Also, Apple computers are always easy to identify in a photo, they all look the same have big ol' light-up logos on them. Windows-based machines and Android-based phones are all over the place, and therefore harder to ID from a photo.
I agree that Thinkpads are great, though. I used a few different Thinkpads at a job I had years ago... tough as nails, really liked them.