The podcast thing is not true. You can create "stations" with different retention settings, and put the podcasts inside.

Archiving is redundant. You can have manual update and update the app as needed, you can have auto update and update all installed apps, or you can just remove the app from your device and install it again later when you need it. If you don't use an app, just remove it. You can redownload it later. Why keep things you admit you don't use?