With the ESP32-P4 not having any wireless functionality and instead focusing on being a small SoC, it makes sense to combine it with a second chip that handles features like WiFi and Bluetooth.
Espressif, the company that makes the ESP-32 chip and its support firmware, is also making modules and development boards to support them. Their module is the ESP-WROOM32, is not just the first module ...
XDA Developers on MSN
Why I stopped buying official ESP32 developer boards and what I use instead
They're reference designs for a reason.
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