Agile methodologies/slack channels/etc. are simply not a replacement for people management. In many companies, the people manager and project manager are the same person, and they generally default to managing the project first. (Squeaky wheel gets the grease, right? And what's squeakier than an executive breathing down your neck?) But when your culture starts dissolving and employees start leaving... well by then it might be too late to get interested in people management.
In my group, morale is a big issue, and retention is about to become one--I know of several people with one foot out the door already. I'm not sure management is even aware.