We do agile, but also use Slack and email, and walking across the room. If your organization is actively discouraging communication within the team unless it go

We do agile, but also use Slack and email, and walking across the room. If your organization is actively discouraging communication within the team unless it goes through the PM, that's bizarre. On the other hand, if the PM is acting as a gatekeeper with customers, that's not unusual. The reality is that you can't have everyone on the team talking directly to the customer, for a whole host of good reasons. Regarding decision-making, that can be a problem---some PMs and product owners are micromanagers, hamstringing their team. But they would be micro managers with or without agile.