Where reel lines are concerned does a more visible line spook fish! I'm not sure it does.
For instance, do line bites happen more often with a line that fishes have trouble seeing or do fishes avoid a more obtrusive line without seeing danger giving fewer liners.
Are thicker lines of less consequence to fish than some anglers, do all ones work in a similar fashion and are fishes laughing at some anglers thinking they have an unbeatable line.
For me, the top and bottom is fish aren't that bothered, they certainly aren't clever enough to know what diameter is or even how obtrusive a line is or not.
I'll give them credit for being a little wary but fish have never had the equivalent to a Steven Hawking, they have never had a record in the top ten, they pay no attention to the plight of Humpback whale. Their sole reason for being is to give pleasure to our angler fraternity who when all said and done have nothing better to do.