Agree. I have couple of RSS on few of the search keywords; have been working fine for a while now. Feedly (which I don't use on daily basis) makes it very hard to extract the feed URL. I lost track of how I discovered YouTube RSS links.
They broke every RSS feed of channels in the folder I had. I've long deleted the folder now, and I'm unsure why I should trust them to have it work this time.
Yea a few years ago they changed the format of the urls without redirecting the old urls. Weak sauce.