It's totally their choice to hide their progress from the public, I get that. But at the same time it's an idiotic decision. Why would you not want to share what you are working on if that could mean more supporters? You say that most companies don't share progress, but almost all developers in this area do. And don't go comparing these developers to AAA studios, because they're not.
But if writing something of an update post like that takes that much time, which I still don't think it does, why would you even bother going into that much detail, and then choosing to hide it. Great, I want to know what this developer is up to, but if I wanted to know, I'd either have to pay them (which I don't know is a financially sound decision until I've actually seen the progress, at which point it's too late) or I'd have to be on forums like we are here.
Are you actually in favour of a chaotic development style? That sounds like madness. Proper documentation and design is crucial to get a project done in a timely manner and to keep things maintainable in the future. If they don't document what they're doing, which they are by proxy with these progress updates, then how do they know they are working on the right thing? Do they themselves realize that they have been working on the same things for such a long time, or have they gotten blind to it by this point?
Saying that if you start documenting there's less time to try new things and develop new stuff is bullshit, in my opinion. If you're going to try out new things, then especially documentation becomes important. When you're trying out new things, you have to keep track of those new things, how they work, how they compare to each other, why you have chosen to use that new thing, etc.
I don't even know why I am so passionate about the way a development team that I know very little about is handling the development of a porn game that I will likely not even end up paying for, honestly.