I've even worked at places with successful products where this mindset is missing, and the success is by accident or proxy to more solid endeavors.

Alignment with vision matters too. Too many companies are like many-headed hydras, where a role like Engineering SREs understand the value proposition and missing pieces of a product or offering better than the actual product management team and executive sponsor.

It's easy to say it's remedial, but it's more difficult for companies to actually live it and be successful because of it. Source: I seen't it.

But it was helpful to start with his books early on in my career.

I wouldn't recommend to seasoned managers, as it does suffer from too much fluff as many business books do, but his message sets a good tone for new managers to aspire to.