It's very easy for Simon Sinek to write and speak about leadership when he has never actually done it. Divorced from the messiness of reality, you can write a lot of nice-sounding platitudes.
Leaders Overshare? Simon shares material non-public information on linkedin. Now he and the company are in trouble.
Leaders bend the rules? Simon bent the rules for some of his team but not others, now multiple past employees are bringing discrimination lawsuits.
Leaders coach and help people land softly? Simon kept too many low performers on his team and now the company's product is buggy, behind competitors and forced to downsize so his entire team is being cut.
I think this is within the team. Maybe you never worked for someone who doesn't share, who keep secrets, within the team. I did. It is frustrating. It makes you doubt every word they say, even a simple "everything is going fine" sows doubt in you, making you wonder if they are hidding bad news. It makes you doubt what you are doing is useful, because some time ago they hide a change of focus for weeks.
Then the secrets are revealed, they are stupid and pointless (not industrial secrets like you imply), they kept it secret just in case.
The best coaches, “mentors” etc I’ve had would never issue blanket advice like that because they know it’d be wrong for most people.
His rant about avocado on toast only cemented my view that he never starts with why he’s wrong every time he opens his mouth.