I just read the article. It's really interesting and helpful. Note that high flotation tires are the numeric sizes (33x12.5) not the LTs (285 75 16).
The 285 75 16, many of our tires, is an LT, not a high flotation, and is still within his recomended sizes for trucks that have a GVW of over 5 thousand lbs. (certainly my X does when it's weighed down with all my gear, recovery, camping, etc.) and which are used often on soft surfaces, also true for me in So. Cal. 285s are about 11.4" wide, nothing crazy. They do not have the flex/surface patch of high flotation tires.
In a sense, in the offroad world, and by this article's definition, 285 75 16s are still tall skinnys for some of us. They are within the realm of optimum by his standards.
But after reading the article, I do have a much better sense of why people are going for the 255s.