How many players get stuck? You say that it's most players. Do you mean just 51%, or do you mean a larger majority, like 60%, or even more?
So far, there haven't been any polls run, to see how many players get stuck, versus how many players don't get stuck. I know that I didn't have any problems, and I know that there are other people who also didn't have any trouble. But, since there haven't been any reliable surveys made, I can't tell you which side is in the majority.
Those of us, such as myself, who don't think that the game needs a walkthrough, probably think that way because we didn't have any problem playing through the available content without one. At least, that's why I don't feel the need for a walkthrough.
I didn't have any trouble getting that scene, without a walkthrough or any coaching, so I wouldn't say that the requirements are all that obscure.
Why? There may be multiple choices offered throughout the game, but, at this point in the development cycle, the number of possible choices is still rather limited. And you have the ability with a Ren'Py game to save at any time, even in the middle of a choice. And you have a virtually limitless number of save slots. Why would you need a walkthrough at this point?
I can see how a walkthrough could be helpful, once the game gets closer to completion. But, even then, I doubt it will be necessary.