How experienced do you feel you are?
Starting light can be great for a couple of reasons, chiefly among which is being able to properly focus on form rather than injuring yourself trying to lift something you shouldn't be. It also lets you progress for longer which can be great for keeping your motivation up. If you feel like you're pretty much starting from scratch with it all, and you're not in a rush (which you shouldn't be anyway), then follow the program as it tells you. If the starting weights are too light just focus on form with slow controlled negatives. Use it as time to try and make that mind/muscle connection for that particular exercise. Also with the time saved getting through your working sets quicker can be used for mobility work, which will be good preparation for when your lifts (especially squats) start to get heavier.