I waited to upgrade my late 2016 MBP to Mojave until last week. Knowing the issues folks have faced, I paid careful attention to the upgrade process. I allowed DPS access to the microphone and the upgrade went without a hitch. Mojave is a very nice upgrade! (yay dark mode)
I also use Adobe Audition and Audacity on this Mac. Both of those audio apps request access to the microphone. I suspect Apple added this new security feature to prevent nefarious apps from using the using the camera or mic to spy on users. It’s a good model that all of the browsers use anyway.
I’ll be pushing the OTA update of 22.214.171.124 this coming Monday. We will be keeping a careful eye on this upgrade process (like we always do) in case anyone experiences hiccups.