"I think the BACKPACKING part of Backpacking Light is still more important than the LIGHT part."
The 'backpacking' part is defined by associated objectives, in that something is actually carried on one's back to achieve the desired end(s).
This end goal(s) can include a wide number of activities, ranging from day hiking, trail running, thru/section hiking, hunting, fishing, peak bagging, camping, etc. It simply depends on where those interests lie, either in general or for a particular day(s).
I would guess the vast majority of people who read/post @ BPL are interested in thru & section **hiking**. That's not to say they also are not interested in peak bagging, hunting, fishing, camping, etc. If they are, there are plenty of other suitable forums to discuss those interests.
Since the emphasis of this particular forum is on **hiking**, most discussions revolve about how to lighten one's load in order to maximize distance, speed, walking comfort or a combination of those factors.
The reason there isn't much discussion on camping is because camping is a beginning topic. That is, practically everyone starts out as a camper, and many still retain their original camping gear. (For example, a double walled tent, MSR gas stove, comfortable pad, etc, etc.) I know I do, and I periodically use these items when taking my kid/wife. But do I have any interest in discussing these elementary subjects? No.
Now, when it comes to faster, long(er) distance hiking performed in relatively easy comfort, the issues become significantly more complicated. It's a real challenge to reach SUL/UL without compromising safety. But it can be done, it just requires a heck of a lot of research, study & skill development (including sewing and learning MYOG).
BPL is a forum focused primarily on these aspects listed above. If you search for older posts, you can garner a treasure trove of science based analyses covering a wide range of topics on practically every single aspect of gear, clothing, food, etc as it relates to hiking.
To an outsider looking in, it may appear that some might possess a slight degree of condensation towards trads. On the other hand, I think most here are simply interested in HYOH to the best of their abilities. Looking upon learners & those who are less experienced really doesn't factor into the equation when you're facing an initial 3-5k climb out, 10 miles of trail, and 3-5 of x-c before you reach your 1st day's goal.