Polling rate also has nothing to do with frequency of updates if you care to receive those updates in a timely manner. I haven't seen a reader default to 30 minutes or less.
Probably in both cases you just notice the bad implementations more because they make more requests.
And Atom supports pagination so you can limit the main feed url to be just one entry while still allowing for clients to retrieve older ones.
https://www.earth.org.uk/note-on-site-technicals-99.html#202...
I'm a small enough deal that I can call out specific readers at the top of a new post. A couple weeks ago I put up a post that started with the aside "hey one of you has a Turkish IP and you're pulling the whole feed every 10 minutes, please stop doing that."
(The podcast where I capture primarily audio material such as voice or sonfification that might as well also be presented in this alternative channel form...)
I'd be interested to listen to your podcast if you were to ping me its URL via one of the contact methods in my bio...