Amazing how thread topics here and what I sometimes have going on pipe and tobacco wise, sync up.
What Fred and many others write about is and should always be taken with a grain of salt because as it's so often said, ymmv.
The method can and does improve the smoking experience....sometimes. For me it's got to be the the perfect pipe storm if you will, the right tobacco cut, moisture content and the bowl size of the pipe selected. Just minutes ago, before viewing this thread title, I returned to a pile of SG's Squadron Leader that I had spread out on a sheet of paper for the last 1-1/2 hours and I bought it in bulk form which means it consists of long ribbon cut and after separating the clumps, picking out 1 or 2 stem pieces, I just gathered it up and loaded it ala Fred Hanna into a medium/large billiard. What you need to know when using this method is that after it's screwed into the bowl, you must tear off the remaining strands sticking up and only use the pad of your thumb to press the clump just below the bowl rim. After it's going you will notice that it won't allow itself to be tamped. The plug becomes very hard and if carefully sip and enjoy it'll stay lit quite a long time. After about the half way mark the weight of your tamper will collapse the ash and that's all your after to this point. A relight and some more quality time enjoying your bowl and it will finally allow you to push what's left of the plug to the heel of your pipe where you will finish down to nothing but ash.
I don't use the method a lot and I'm batting about .500 on my technique and it's important to note here that if you do try it and it doesn't want to draw properly before lighting, dig it out and start over, it is not a forgiving packing method and there's no tithing your way through it.
As we speak the flavor complexity of this particular bowl of SL is amazing, I'm getting hints of sweetness and nuttiness much sooner than I'm used to using the conventional 3 step method. Give it a try, the worst that can happen is you might have to relight a bunch of times.