The more time goes by, the more I value what I learned from Peopleware (DeMarco, Lister) 20 or so years ago. It seems so clear, precise and uncluttered compared to modern efforts.
The big issue it has, IMO, (which other DeMarco books like 'Slack' share) is that it does not provide actual case studies that would convince a typical executive / manager working in a high pressure / competitive environment to change their methods.
Along with Mythical Man-Month, it's clear that we didn't need any other management books.