"Whatever your interpretation of the article on Palamas might be, I am not surprised that a Protestant found Palamas congenial. Even though Palamas came to the defence of monastics' direct experience of God, I have long thought that Palamas has many points that Protestants can agree with. Perhaps more than Roman Catholics can agree with. In fact, it seems to me that Roman Catholics don't care much for what they encounter in Palamism."
As a former Protestant myself (although my days of being a convinced Protestant are more than 20 years ago, now) I have to agree with this. The Orthodox approach to the inner spiritual life was what ultimately drew me to Orthodoxy -- even though at the time I was "Western" enough not to understand that this, and not an assent to a body of dogma and doctrine, was actually the key thing about Orthodoxy.
I've not analyzed just why Palamas and this aspect of the Orthodox life is particularly congenial to many Protestants, but it is rather true.
Also, it is interesting that Harley boils down all of Christianity to the Reformed and the Orthodox approaches, with all others being variations on those themes. This is particularly interesting to me because of the fact that when I was on my journey to Orthodoxy, I thought that my final decision was going to be between Catholicism and Orthodoxy. That decision proved to be a very easy one, but at precisely this time, I found myself actually feeling as though what I really needed to do was to go back and review the Reformed/Calvinist tradition in my mind.
The last "comparison" I made prior to commiting to becoming an Orthodox Christan was between Orthodoxy and the Reformed tradition. I had completely forgotten that.
I think there are several reasons for that. But probably the most important is how Biblical Orthodoxy is. Unfortunately for most Protestants, they first see priests in vestments, bishops with long beards, icons on church walls; and once they get that first whiff of incense, they run out the doors.
Orthodoxy is a Biblical form of Christianity with a rich theological tradition. It pays to be patient and read, read, read.