I work for a service that creates "RSS" feeds as a side effect of what we do and they've all be Atom for 10+ years with no issues.
Please let the RSS format die.
In theory it's a simple protocol, but there are so many differing implementations that it's a full-time job to keep up with all the little warts.
Making complicate protocol simpler require process equivalent to rewrite in software. Re-architecture the basics. It is more then seldom to the point you can think all that complications are intentional.
One example of simplification that happen in IT is UTF-8. But it was more a replacement and big companies didn't switch anyway...