system_adc_read_fast() and WiFi

[andrewtinkers]

I have been using system_adc_read_fast() while the WiFi module is on (although not transmitting). I don't see any issues with the results, but maybe there are other issues?

The documentation says:
"To use system_adc_read_fast, Wi-Fi has to be disabled."

What are the expected adverse effects from having WiFi on, and running system_adc_read_fast? Does the WiFi TX add a lot of noise to the rails, which can contribute to ADC noise? Or is there another reason this is not recommended? The SDK seems to allow this, and returns satisfactory results.