Puck.JS PCB design question, why a separate blue PCB from Raytao Corporation, what about it??

@DrAzzy hit the nail on the head here. The module manufacturers can get the RF design totally sorted, but also they can get all the different certifications for their modules.

If I were to try and get all the certifications myself it would cost tens of thousands of dollars. Not only that, but to put everything on the board myself I'd need:

• The microcontroller
  
• A selection of different capacitors and inductors for tuning
  
• A high speed oscillator
  
• A ceramic aerial
  
  

at minimum... The cost of all those parts in ~5000 qty actually adds up to the same or more than an individual module costs!