I recently took Mr. Thein to task for something he said about sharp tools. Obviously my motivation was that I am an asshole. However, there is a rationalization here. This is bad pedagogy, and promotes a myth that is prevalent in photographic circles. Mr. Thein claims to be all about education, so taking him to task is reasonable, here.
If you want to learn to play the piano, I can tell you immediately what piano to buy. You should purchase an older American made grand piano, rebuilt to the highest standard, with ivory keytops. Steinway is always a solid choice, but Chickering, Knabe, and a few others are also excellent if you select the year of manufacture with a little care. The rebuild is because that's the only way to get ivory. An acceptable alternative is a new concert grand.
Go for the 9 footer if possible. This is the best instrument you can obtain, and it's going to cost you about 100 grand. But it's the right tool for the rank beginner, because it will fight you the least. Of course, budget may be an issue. Do not get an upright or a digital, the actions can be truly excellent, but they're simply not grand piano actions, and grand piano actions are better. Do not get anything under 6 feet long, the tone in the bass is going to be muddy, it's physics, and that's going to interfere with your ability to hear clearly what you're playing.
The same applies to cameras. I used to own a Bender 4x5, and while a perfectly serviceable camera, the Sinar F1 I have now is simply better. It fights me less.
For decades the canonical starter camera was in fact a superb instrument. Simple, robust, well made. The K-1000, the FE2, and so on. These cameras fought the user almost not at all, they did a simple job well, and more or less transparently. They were perfect for the beginner. And just fine for the expert.
It is only now that we decree the beginner should start with a Nikon D3300 or the Canon Rebel Whatever. These are infernally complex machines, and I think in fact wildly inappropriate for the beginning. They're a weird and confusing mixture of unsophisticated "scene modes" and powerful advanced autofocus and exposure modes that even experts have trouble fully grasping.
But we have to start out cheap, and then only when we're "ready" can we move up to the sharp tool that is the D810, or 5DMkIV or whatever?
This is madness. The proper tool for the beginning is neither end of the scale, but an imaginary and much simpler machine. Given the reality of what is available, I suspect that the more Professional models, with fewer helper modes, would be better. I was a beginner back in the Good Olde Dayes, and am not any more, so I cannot be sure.
All, up, the beginner is going to have trouble with any of these instruments without a helpful mentor to tell them to stick it in Av (or M) with a center weighted meter, and leave it there for a year. Since that's the proper path anyways, it probably doesn't matter which you get.
No matter how you slice it, the myth that you have to be ready before getting a good camera is a myth, a very modern myth, and it deserves to be savagely kicked in the face every time it pops up.
But I'm still kind of a jerk.