I had a similar question a while ago and got this answer from Christi. The bottom line is that for most practitioners it is not always possible to choose silence, and even when it becomes possible to choose it at some point during meditation, it complicates the simple procedure of Deep Meditation practice.
So, I’m sure favoring stillness instead of the mantra during meditation is cultivating inner silence. It’s just a much more difficult practice, and therefore for the average practitioner less effective and time-efficient in cultivating inner silence.
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