If you have a stereotypical corporate antagonistic divide between workers and management then I completely agree. Good planning and estimation is about managing upwards and managing expectations.
If you are in the context that this post was about, with no or very little divide between management and workers, where blame for delays or praise for being ahead of schedule is equally or nearly equally shared among everyone it's quite a good essay imo.
If you have a stereotypical corporate antagonistic divide between workers and management then I completely agree. Good planning and estimation is about managing upwards and managing expectations.
If you are in the context that this post was about, with no or very little divide between management and workers, where blame for delays or praise for being ahead of schedule is equally or nearly equally shared among everyone it's quite a good essay imo.