Network bridges (here he's talking about an audio bridge, which is a network endpoint for audio playback) are great if you want to do multiroom and if you want a server placed relatively far from a system. Depending on your software and UI needs, they can also give you all sorts of advantages: using different types of playback software - say there's one or two you like for different reasons - some steamers let you quickly switch between them. For instance in my system, I can switch between Roon, LMS, and HQPlayer at the streamer/endpoint level. I can also implement DSP or DRC differently for each endpoint.
A Raspberry Pi 3 or 4 is also great for this purpose.