Sam Harris IMO is very smart and has a lot of great takes on politics and no-self. But He hasn't awoken to the whole array of spiritual infinitude. You can get a hint of that if you listen to his mushroom trip experience. He says he has a collision with what he would call the holy spirit if he were a Christian. But then he implies that he is too "wise" to fall into the traps of "basic Christian minds." Also implying that he doesn't quite value mystical experiences if he can't define them in his own framework. He has however begun to take quite an interest in psychedelics and I think that is good news for him moving forward. Psychedelics can open him up to everything else his current scientific partly stage orange worldview is holding him back from.
His meditation app is the best one I've found. He is helpful and he brings in many other helpful teachers as well. Giving the app quite the buffet of spiritual paths. He is also about to add a psychedelics section in there. I'm curious to see what that will be about.
In spite of all of the valid criticisms of Sam, you will find he is still an amazing person to keep in your merry-go-round of mentors. Just don't limit yourself to everything Sam limits himself to.