I can't express enough how important sound is to a podcast. You say, but don't all podcasts have sound? I'm talking about good sound. Sound you can hear. How many times have your tried to listen to a video or podcast and can't understand what they're saying? That detracts from the experience. Michelle and I use mics whenever we're out fishing, hiking, etc. And because of that we capture some great moments. In this podcast from Rocky Mountain National Park, I include some of those great moments. And all because we use mics. 
https://bit.ly/RodeWirelessGoii
https://bit.ly/MicMiniDJI