

No, it’s objectively bullshit. It’s been studied many times and the result always proves that carbrained nonsense to be bullshit.
Drivers break the law all the time. They run blatant reds. They fail to stop when safe to do so at a yellow. They speed. They ignore stop signs. They fail to give way to pedestrians. The pass cyclists too close. They fail to indicate correctly at roundabouts more often than they do it correctly.
The only difference is people are too carbrained to even notice these. Oh, and the reasons for it (cyclists tend to break the law for their own safety unlike car drivers who do it for convenience) and the consequences when they do (cyclists endanger nobody except occasionally themselves, drivers endanger everyone around them).

Who said anything about racing? It costs a huge amount. Starting on a 10% grade hill is an enormous amount of energy compared to just keeping going as you were, and it puts you in significant danger as you do it.