I'm also using an E m5 mk2 on macos, with the battery holder grip and 25mm lens. I'm happy with the image but the software is pretty bad, isn't it? There's a substantial lag between the audio and video which is disconcerting to the viewer. And the video stream doesn't reliably start. I usually have to flip the video off and on a few dozen times in the Zoom app before it begins working.
Aside from that the cost of the Very Special USB Cable is a real insult.
I haven't had the same experience at all, perhaps its because I'm on windows? I also don't use my camera as my audio source. I use my laptop microphone for now, with plans to get an external microphone. I just use the usb cable that came with the camera, I never had to purchase it separately.
The battery I use is one that uses the shell of a matching battery but provides a wired 8V DC through a usb SMPS, 20$ from aliexpress and I never have to worry about it.
Aside from that the cost of the Very Special USB Cable is a real insult.