That’s something I noticed a while ago: all podcasters have those huge microphones in front of them - sometimes with a gigantic boom - that wouldn’t look out of place on 1950s TV. But unlike in the 1950s, they’re not trying to hide them, no no: the more visible, the bigger, the better.
I can’t figure out the point of that prop. If I did a podcast, I’d try to unclutter the shot myself.
I assume that larger size could be less sensitive for when the speaker repositions themselves. Imagine sitting still for two hours while talking about topics that steer up some emotions. It’s just more natural to move a bit.
(I have no idea, I just assume that bigger microphones help with that)
If you’re really moving a lot and don’t/can’t move the boom with your facehole, I think you’d be better off with a lapel (small clip on) mic. While it’s true that you will always be heard, you lose depth in the voice fast if you move away from even the larger mic’s. I used a large condenser mic for a while during gaming, but I move and reposition a lot, more then I like to adjust the boom. So now I use an Antlion ModMic that clips on my headphones.