If you want to build a house, who do you learn from?
If you want to rock climb, do you ask someone with experience, or someone who has never done it?
If you want to learn SCUBA diving, do you take a course from a certified instructor, or do you plunge in and see how it goes?
If planners seek to improve conditions for driving, do they design the changes with an untrained driver in mind?
What is it about traffic cycling that makes everyone think they're an expert?
Why does a 40 year old guy driving his pickup home who has not ridden a bike since he was 10 think he knows where bikes "belong" on the road?
Why do traffic engineers seek to make riding on roads "comfortable" for untrained cyclists who don't know what they're doing?
What's wrong with designing "facilities" for those who are untrained? As an answer, I find the following George Orwell quote to be apropos. Though he's writing about languages, I think it's true in general:
"But an effect can become a cause, reinforcing the original cause and producing the same effect in an intensified form, and so on indefinitely." - George Orwell
So untrained cyclist discomfort in traffic is a cause, and the effect is the creation and support of bike lanes. Few argue with that.
But, an effect can become a cause..., and, so bike lanes become a cause, reinforcing the original cause (untrained cyclist discomfort in traffic), and producing the same effect in an intensified form, and so on indefinitely.
Discomfort in traffic -> bike lanes -> more discomfort in traffic -> more bike lanes -> even more discomfort -> even more bike lanes -> yet more intensified discomfort ...
You end up with a nation of people who are disabled from riding in traffic by their own internal feelings. Is that the direction you want to go?