Raspberry Pi + Zigbee module = Get rid of bridges?

Yes. I use the headless version. I connect to the Phoscon App with my web browser. This is needed to bring the device in connect mode, same like pressing the button on the philips hue hub. It’s also good for debugging, with osram und philips it had auto-discovery in Openhab, with aquara not - needs some manual install. For philips hue you also need the hue binding in openhab.