On iOS the toggles are off left, and shown as dim grey. They turn green when you shove them to the right into the on position. That's about as much as my brain can process.

In many other environments these clues are more subtle or completely absent and I never know which is which.

I don't necessarily wish my check-box back, because I think a slider is easier to handle on touch devices[1], but it should be done in a way that indicates the status clearly. Apple's use of color is also not perfect, but at least they did not fall into the trap of using red and green. Light grey and vibrant green should be distinguishable for most people with color deficiencies even.

[1] At least when implemented properly. I am looking at you Ninebot. Your huge on/off slider only let's me turn off my scooter when the stars are aligned right. I don't even bother anymore and just use the button on the scooter.