egg No, you don't sound critical, just interested :) All good questions.
Yes, yoga is a good example as makes sense on a logical/known level as well as a spiritual/unknown level.
The 3Ps can often offer people incredible levels of calm, clarity, confidence and release from fear, anxiety, depression etc. Mindfulness is just one of the benefits. Gratitude and positive thinking are common benefits too.
It also gives people a similar feeling to meditation as we are also more able to see that that 'place' (the one we use techniques like meditation to access) is actually there all the time, just sitting underneath thought, once we see that, it's easy to feel that way in a moment.
Yes, it's 'awareness that your thoughts are not reality' but the way in which the 3Ps is conveyed seems to create a mindshift where we see that truth at a different level of understanding. It becomes a belief set rather than a conscious thing to have to remember to do or think - does that make sense?
Once we have that new belief set (or it's more likely that it's the mindset we were born with that we were trained out of), we instinctively seem to have more helpful thoughts and are able to see much more easily that painful thoughts are just thoughts.
And it's not just that they are thoughts are not 'us', they're actually quite unimportant compared to the principle of thought as a whole and just infinitesimal as part of energy that we're all made of and connected to.
I haven't had a chance to watch this myself yet but this might explain things better than I can in writing :). Dicken is a well respected 3Ps psychologist.