Honestly, I listen to him all the time and could hardly tell you what his investment advice is beyond “15% to retirement in growth stock mutual funds”, and that he recommends ESAs before 529s. Investing is really not the focus of his teaching.
I frequent a couple DR boards and the vast majority of his followers once they reach the point where they’re debt free with an emergency fund and actually HAVE money to invest kind of go their own way when it comes to investing. I personally think 15% is not enough and I have a different AA than he would probably recommend. Same deal with the 529s. I had my son’s in age-based which he hates. In hindsight I probably should have listened to him on that one! But, the market could have sucked the past 10 years instead of growing like crazy.