RE:clear intermediate to backing connection?
All that being said, there are times when I am 'in the loop' (wow what a bad workplace joke!).
Hybrid sinktip systems for big salmonids in rivers depend on good loops systems - in fact loops are a critical part of the equation. There is still an allbright on the back end and a nail knot on the front though, the loop allows on-the-spot blending of various tapered segments to each other to match current, depth and presentation needs.
Some of the more advanced flylines with long-term no-cracking finishes require a loop to attach line to leader butt. In such cases the loop to leader is the only way.
Trey Combs writes about using a large loop for changing entire fly lines on the same spool from the back-end.
Marvin - that stuff you sent a sample of the other day was very interesting. Did you just pull it inside itself using a needle?