with pike lures I catch less fish if the lure has been fouled in any way, no doubt it will seem strange to a fish to see something clinging to debris in mid water.
the straight line thing is a very big argument

I dont think it matters much, especially with flies like spiders that have natural movement in them. Curved patterns have there place too, but again wee beasties dont stay curved all the time either.
the bare hook trick is nothing new, I've heard of guys that just paint there hooks, red for bloodworm and so on. take a look at scratch's brancuzi buzzers, just a bit of epoxy on a bare hook! simple but genius.