First off, let me say that you seem to be meandering very close to troll-territory with the subject of this post and the blog post you reference. I'm assuming you wrote the blog. Backpackinglight is chock-full of (to quote your own words) "Forum Crazies"- who will undoubtedly attempt to refute your decision on your sleeping bag choice with an incredible amount of statistics, data, opinions, etc...just your blog post predicts. If you don't believe me, just check out the recent thread on sleeping quilts. But that doesn't mean were a**holes, nor are we crazy. I'm not sure if you're are trying to elicit a negative reaction with this post but let's hope not.
Simply put, we can't help it. Many of us simply love talking shop. For us, the discussion isn't (as the blog post submits) 'market-confusion generated by these companies to justify huge and diversified product lines'. For most BPL actives discussion of gear is a passion, just as avid golfers might debate club choices or performance sports car enthusiasts might debate which set of tires to put on their Porsche Cayman S.
As for the myriad of product choices in UL gear, many of the choices discussed on this site are manufactured by small cottage business, run by hikers, for the benefit of hikers. They're not trying to justify bloated product lines by reinventing the wheel ad nauseum. They're just tweaking, refining, and genuinely inventing. Mainstream gear producers such as Marmot, The North Face, etc. have far less cache with the discriminating costumers you'll find on this site. Now, on other backpacking forums, that rule might be reversed. So the 'truth' about product choices you espouse on your blog isn't necessarily accurate.
Admittedly, for the uninitiated, all this gear talk can be confusing. By rule, much of the talk here isn't oriented towards the beginner hiker. Most of the frequent posters here are (I hope!) experienced hikers who are sharing their experiences and opinions on gear they have used quite a bit. These forums can provide an incredible amount of education to the neophyte backpacker but he or she will have to sift through a lot of information to get in the know. There will also be a certain amount of trial and error required. One redeeming feature of BPL- all are welcome. We're generally a friendly bunch. In my 3+ years visiting BPL, I can't recall a single instance of a 'Noob' with a basic question who was treated poorly. If you don't know then ask. Someone will help...and generally give you good advice to boot.
At the end of the day, gear is just that- gear. Just a tool to help you explore a little dirt path winding its way through a patch of woods. In the never ending quest to shave every quarter ounce off of our backs I feel we sometimes lose sight of that here at BPL. It's true that for some, its more of a mechanical exercise than a real-world application. Again, just talking shop. But the message is simple- the less weight you carry, the more you can hike and enjoy that hike. That's really what its all about. Every person has their own comfort level about what they can and can't leave behind and what they 'need to carry' to feel comfortable and secure on a hiking trip. Sometimes, no amount of logic and reasoning will dissuade a person from leaving behind their obscenely heavy folding camp stool (at 20 ounces) or their backbreaking full length inflatable sleeping pad (at 21 ounces). And that's fine, as long as those items don't keep you from hiking the hike you want to hike.
As for your choice- it's a good one. Sure, there are lighter bags which will deliver the same performance and it might be overkill for warmer hikes. So what? Many people have hiked far, long, and wide carrying bags far inferior to the Marmot Helium. The important thing is to pack up that bag and hit the trail. And if you need a recommendation on which alcohol stove to bring along post your question then postpone your hike for the next two weeks while we fill you in on all you need to know.