That depends on how you approach it... If the intention of chanting and watching a breath is to bring about something, then it will not lead to realization.. There are many people who are chanting for 40-50 years with same attachment to body and mind...These are ways to calm, focus and empty the mind, to create mind states and periods of stillness/presence.
But what I am saying is chanting and breathing can be used as an aid.. It is not a must but it certainly is helpful sometimes...
There is always a restlessness in the ego, and it always wants to do something.. Sometimes, directly trying to explore the ego and its motives may be difficult if there is this restlessness.. These aids help us in reducing that restlessness..
I used the word 'slight focus' because I wanted to mean that it shouldn't be a stress, a concentration or any kind of doing for the ego....