You are Tony effing Robbins; that’s why we were there. You don’t need 30 minutes for someone else to tell us how much value we will get out of it, and another 20 minutes for you to tell us you’ve been doing this for 43 years before you get into the crux of the matter.
Man, this stuff is so hard wired into us. Validation. Justification. You’re right. Not needed. Writers do this all the time. Start out justifying and explaining why they are qualified to have an opinion. No need for that. Unless you’re a surgeon. Then I just want to be sure before I count backwards from 10. But for writing or speaking? Not so much.