If driving, not everyone wants to have to search for the buttons to do that, accidentally skip too far ahead, have to go back a step or two, etc.

Usually I'm listening to podcast when doing dishes, or grocery shopping, at the gym, or on a walk. I don't really want to have to take up my phone to skip an ad, and the controls on the headphones are too janky. This would definitely be a killer feature for me.

"Siri, skip ahead 30 seconds". Doesn't always work, and... sometimes, it's 60, sometimes it's 2 minutes... If it's a podcast I listen to a lot, I usually know if it's a 30/60/120 second ad spot. Even the voice command to do it isn't always convenient though, I'll definitely grant.