But the technical answer to "why is my email landing in spam" is still "follow best practices, build up reputation, and you'll be fine... unless Google decides otherwise, which they can". Posting about how unfair that is is not going to change anything.
It won't change anything, unless enough people complain. And even just recognizing that things are not right is the first step required to make a change. Of course, I won't hold my breath waiting for Google to change their ways, but I think it is in fact important to make a clear note their is not the right way. As the guy writes:
"Maybe it is just so, that big companies ignore small external senders who are sending mail to them, simply because they can, and we can't do anything about this (however, it's always worth trying to check whether we really can't - and that's what I'm doing by posting my issue on this list). But even if we can't do anything about this, we should not pretend that everything is OK, they are correct, and it's the sender's fault. No, on the contrary: we should state it explicitly and clearly that this behaviour is not OK. Maybe we have to live with it; but it doesn't make it less bad."