In most cases you are probably correct, I'm not really commenting on those particular instructions. I'm just making an observation about the responses based on comments people give about problems they are having.
I've read through the instructions and they do seem straight-forward enough. In fact, they are actually quite nice. But that still does not mean that some people will not have problems along the way. Not that I have any evidence to back this up but I can think of a few possibilities of why people may have problems:
1: The installer keeps failing for some unexplainable reason. Maybe they don't have the user rights, maybe the IT department is blocking it, whatever other possible install problems. You can't assume that everyone will understand why the installer is having issues on their particular computer as compared to another. We're already seeing reports like this for the new installer just released, I guess those people can't follow the simplest instructions of double-clicking an exe installer correctly. Right?
2: When they get to the line ending conversions part; what if they don't understand the options and abandon the process? Remember, some of these people are new to Git and without some hand-holding they may feel lost. In the screenshot I see there's no recommended option. So it's up to the user to pick the one they need without knowing what they need. Unless there's someone to point it out. And considering some people's attitudes about noobs doing the "wrong" thing then options like that are rather important to consider properly. Do you want to bet whether someone has complained about someone else picking the Windows-style checkout?
3: Even though the instructions are nicely laid out, not everyone is accustomed to the command line. I bet there's a huge number of Windows users who have never used the command line. Even with simple instructions there's the possibility for mistakes. There's even an extra section just for SSH that clearly shows that some people have issues with that part, even Github is trying to address it right there. But they can't possibly cover every conceivable issue.
Notice that most of my examples have nothing to do with the instructions themselves, but unforeseen problems that we have to deal with simply because so many people have different computers with different configurations with different networks with different IT departments with their different mandates. The attitude that it's simple for me therefore it must be simple for you is a bad one. The new installer worked for me on the first try, I don't dismiss the ones that did have a problem for some reason.
But to further prove my point about my two responses from before, Github decided to go with response A. How do we know? The release of the even simpler all-in-one application that started this whole conversation. Even with the "simple" instructions that have been pointed out, Github decided to listen about problems with the process and have responded with an even easier method to accomplish the same task. Even go above and beyond.
That is the mark of a good software developer/company/project. These are people trying to be inclusive, not exclusive.
Sadly, too many people in this thread decided to go with response B. Thankfully, Github disagrees with that attitude.