Solocast settings for Discord : HyperX
HyperX SoloCast microphone review
Razer Seiren X vs HyperX Solocast? : audio
HyperX SoloCast USB Condenser Gaming Microphone
None of my friends have mentioned anything either.
The cardioid polar pattern means audio is picked up only from the front, and not from the sides or rear.
The headphone jack really comes down to how important is it to monitor your voice.