I dont know that a dimple with be simple to achieve.
Not really a problem. In fact, the very malleability of the N&L tie I was wearing today prompted the question: That's at the end of the afternoon, but the knot held a nicely defined dimple for most of the day.
Designwise and colourwise, yes. I bet some of the so-called senior members here would say they are ugly in the extreme.
Most of the silks are woven in England Because they have complexes but a lot of other members including many non posting readers love that sort of thing. And, many mainstream Americans love Duchamp ties.