I never mentioned Hydrophobic.
You mentioned the meniscus of mono vs. lack of meniscus in fluoro. Mono is hydrophilic and water will be attracted to it, hence the meniscus when sitting on water. A hydrophobic material should have no meniscus, and lower surface tension due to its ability to actually "repel' water in the surface film. Aside from density, this is one of the reasons it sinks.
If you'd used FC as I suggested for the conditions I suggested you would reralize it would sink not float.
Yep, but this creates more drag. For dries, you want the line to be grabbed by the water the least possible. How you do that is have it float high.
A presentation (cast) can create a senario for a natural drift with a stiff material also.
I'm not sayin its impossible to get a drag free float. I'm saying none of us are successful on every cast. Most of the time in dry fly fishing, our entire focus is on getting a drag free drift, that is priority #1, and its hard. The best dry fly fishermen get it right more than the worst, but noone gets it right every time. Seems counterintuitive to me to make it even harder.
Again, the fish aren't line shy, they are drag shy. If it weren't for drag, they'd take a 0x tippet just fine. Not only am I not convinced of its visibility advantages for surface work, I'm not convinced a visibility advantage would even lead to a fishing advantage.
I was trying to encourage the readers to find solutions other than obvious ones for the sdake of growing theior knowlege and having more solutions in their fly fishing vocabulary of experiences.
Agreed, just trying not to send them in the wrong direction. Too many times I see people claim you gotta use fluoro, and then they're going to 7x and 8x claiming you have to go that fine to avoid drag. But 6x mono often has less drag than 7x fluoro.
I don't dispute fluoro's advantages in abrasion resistance, knot strength, longevity, and "water cutting" ability. I'm on the fence regarding its invisibility advantages for underwater work. But I'm pretty certain mono (actually, copolymer, not straight mono) is better for dry flies when drag is an issue, which is most of the time.