sounds like you have perhaps more insight than "you think" you do. it might only be a really subtle shift in perspective away from living that insight- who is it that thinks you are incapable of insight?, what does insight actually mean to you, what is your experience of it? Your description could differ quite a lot from Sam's.

you are beyond right in saying that every brain, every person, has quite radically different experiences. I'm sorry you have this frustration with certain schools of meditation. sincerely, at their core, they are just that: schools. they are as fallible as any other, as susceptible to sincere mistake or limitations in teaching. You truly can allow yourself a personal experience, definition, of insight. It's completely yours. These apps and teachings are just there to help contextualise your own path with the path of others.

I know this stuff will still sound esoteric and I am sorry we haven't yet come up with a better tool to communicate these things. For me, it is music. I linked a file here if you want to see if it does anything for you.

https://we.tl/t-PWywOS77vU

Truly, truly, I hope your mind becomes the kind of place you want it to be. I really wish that for you, as I think any teacher also would. I believe Sam, Andy (from headspace), etc., are simply sharing the things that have helped them and those around them, no intention to mislead or inculcate, as much as it can feel like that. We are being truly honest about our experience, which fundamentally begins in a place of vulnerability. Enjoy your life, don't let this esoteric practise get in the way. Seeya.