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Unless a beginner plans to sell a design on the public, there is no EMC (compliance) issue.

Maybe EMI crosstalk. But WIFI and BT are supposed to eminate out like a radio and jump across boards. That's the point.

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USB is a matched impedance differential pair. Are beginners really running high speed USB differential pairs down their circuits today?

Because that's a really.... Erm.... strange.... definition of a beginner. IMO anyway.

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Depends on your definition of beginner. It's trivial to put a nrf52 module (like [1]) in a PCB design and wire a USB socket to it; just make sure to route the data lines as a differential pair in kicad (add protection diodes if feeling fancy). And speak a little prayer that it actually works as intended. No need to understand what any of that means.

Of course the notion of using such a module might be a step up from beginner for you, but IMHO it's more about the understanding. But I agree that there is no definite definition.

Disclaimer: I'm a beginner by my definition.

[1] example module: https://www.waveshare.com/core52840.htm

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