I am a devotee of the sheet bend knot in the hammock ends, rather than the whipping technique. I don't think I'll have a problem.
With three layers of material, it is getting to be quite a handful of material.
We'll see, I guess.
Also, I plan on using the hammock as a "convertible," flipped over with the net on the bottom, when bugs are scarce. If it were sewn on assym., I don't think that would be possible.
Good points you bring up.