Maybe I'm cynical, but that reads like a pure monetization strategy to me.
There are many distractions that can happen, not necessarily mind-wandering. There are other distractions like getting bored or falling a sleep, discomfort in the body (which includes itches, pain, needing to move, etc.), outside noises, forgetting to focus on your breath, etc. Your mind is constantly seeking new stimulus while you're trying to calm it down.
For me, it's hard to do that without getting distracted. Maybe the easiest part is remembering to focus on the breath after you get distracted. But that's also easier said than done.
So here's the thing, whenever I read stuff on meditation, it often quickly veers into these frankly even sometimes pretentious discussions and concepts that I honestly dont understand. I could be wrong, but it reminds me of a lot of the hand-wavy "bro science" workout advice I've heard.
The best ways I've found to meditate, or rather I should say to at least reach my goals of meditation, so far are a hot bath or listening to music.
Anyway, I choose Transcendental Mediation because of the form of the meditation: one is assigned a nonsense mantra phrase, which the meditation technique is nothing more than finding a comfortable position, closing the eyes, and repeating the mantra in one's head for 20 minutes. Thing is, after about 5 minutes a complete psychedelic trip occurs; the nonsense mantra fills your head with nothingness, no logic to "think". After 5 minutes your brain just trips. I'm aware of the mantra's echo, but I'm in fractal landscapes skipping tra-la-la with Bambi and blue meanies. Really.
This is why I think all these meditation apps are a joke, as they impede too much, they guide too much to enable experiences as I get when I meditate.
* Initially, committing to a daily practice. After 6 months this problem disappeared one my meditation became a habit.
* Getting comfortable with the different techniques. Focusing on your breath is fairly straightforward (in practice, but equally quite difficult to start with) whereas techniques such a loving kindness and resting awareness can be a bit tougher to understand. The Headspace forums suggest everyone struggles with certain techniques, so having a guide was useful (for me).
From reading of "The Science of Meditation: How to Change Your Brain, Mind and Body" it seems there is always more to learn but as an app meditator I can only give you the above experiences.