Ok, if someone tweets to you "Check out this cool podcast" and provides a direct link, how many steps does it take for you to subscribe?
If it comes pre-bundled, click link, that opens in Podcasts app, click Subscribe.
If it doesn't, they've still currently got podcast integration with iTunes desktop, which means there will still be an iTunes page and itunes links will work, they just won't redirect to the itms-podcast protocol or whatever it is. They could link to the app from there.
Being in the music app also allowed them to be searchable by spotlight, which even gave you a blue indicator of what episode was un-listened.