Is the Honda Dio 125 safe enough for everyday riding?

Yes. The Honda Dio 125 comes with Honda's Combi Braking System (CBS), which helps distribute braking force between both wheels for more stable braking. Higher variants also get a front disc brake, while all variants come with tubeless tyres and a side-stand engine cut-off function. While it does not get ABS, the overall braking setup is suitable for daily city commuting.