because when you stopped for a longer time such as traffic light or at junction, the engine will "switch off". When you press the accelerator, it will start the engine.
To me this is dangerous as this causes delay which might cause accidents.

no sure about other cars but my MYVI has it....there is definately delay about 1-2 seconds before your car start to move vs eco-idle turned off.
When crossing, we want to move as soon as we step on the gas...not 1-2 seconds delay.

I've been using Eco-Idle since I bought my car. The delay is negligible for automatic transmission. If you say the delay can cause accident, that means your judgement of safety to cross the junction is off. Those who have the mindset of "sempat lagi ni", will have this risk. If you are a defensive driver and always make sure the road is clear to cross, you won't have this issue to worry about.
Eco-Idle help to save fuel. TS want to turn it off.