I do too, which means I have to make a call to the feedUrl so I can get info the Index isn't currently parsing for, but also make a call to the Index, just to make sure the podcaster might have a value block.
Prior to needing to get info from the feed that wasn't in the Index, I only made one call, to the Index, since it had all of the info I needed.
If I did it to save code and bandwidth, I suspect other apps are doing it as well.