A lot of what they say is really obvious, except if you are an incredibly toxic individual. The core problem with this is not that it won't work IMO, it's that

A lot of what they say is really obvious, except if you are an incredibly toxic individual. The core problem with this is not that it won't work IMO, it's that the right people won't internalise the advice. If you were genuinely questioning whether this advice makes a difference, I'm happy for you. You've apparently never had to see the examples of where it is not applied. I can tell you from experience that working in a team with one or more toxic leaders is like dying a slow death every day you come to work.