I think the important thing to note from my experience with Zoom is that it is clearly possible for something to change the audio device settings that WSJT-x uses WITHOUT Wsjt-x knowing about it. The WSJT-x transmit audio was clearly going to the speakers (I could hear the tones) and not the radio interface (no Tx power output) yet when I opened the WSJT-x settings it showed the Rx and Tx audio set to USBcodec.