Can't use in heavy rain
Can't use if got strong direct sunlight
Can't use in the fog
Can't use at night if poor illumination
Can't use when looking at a plain wall (pedal misoperation control)
Can't detect lorry trailers

Basically in the conditions when you need it the most, it doesn't work.

When Perodua implements radar-based driving assist, then that's something worth talking about.

Tenkiu for sappork but I sked kena reported to Youtube for inappropriate content coz my face too ugly 
When playing phone while driving in traffic jam in the direction facing away from the sun....

The direct sunlight limitation probably more applicable in the morning and evening when the sun is nearer to the horizon.

It is basically like your eyes....if the driving conditions are in such a way your vision of the road is impaired, high chance that the cameras are impaired too. Other additional limitations such as cannot recognize lorry trailers and motorbikes/bicycles.