Safety, and it makes a lot of sense during a race, I would have differentiated (if that’s at all possible) between a race and an ITT though where the rider is only really endangering himself.
I don't like this rule at all. If they ban turned in levers above like 15° then that's fine i guess but not straight. Straight is less comfortable
I had a pro bike fit and he turned mine in about 5 degrees as it's how my body is; it's stupid to make a blanket rule on a bike part which should have some tolerance.
It’s stupid to criticise a rule for not allowing something it does. There is a 10 degree tolerance, just like speed radars have a tolerance.
The problem is exactly the same, there are people that will tell you the limit is too low or ridiculous (personally, I agree but when I see how some others drive, it’s better for everyone there is the rule) and that driving faster doesn’t increase the risk of an accident. Firstly they are only considering themselves and secondly not objectively. There comes a speed at which even they will admit it gets dangeorus but risk doesn’t suddenly jump from 0 to 1 at a limit, it increases progressively and that is why rules are made, because someone has to decide that limit and anyone who doesn’t wish to respect it does so knowing the penalties.
I’ve read some ridiculous arguments, obviously very few people think things through and even less try things out (in the situation the rule is intended for) in order to see for themselves.
After that, the benefit of the position is very much overestimated (because it isn’t measured in situ but theoretically (just like your promised and real-life car mpg) and for some reason, a most ridiculous figure is the one most now claim in arguments for doing being allowed to use it; 25W gain at 40km/h for narrowing the handlebar width 2cm, haha.