CentOS 7 is supported and will be EOL at the same time as RHEL 7. Stream does have major versions so you can continue to use CentOS Stream 8 and get backports.

CentOS 7 is supported and will be EOL at the same time as RHEL 7. Stream does have major versions so you can continue to use CentOS Stream 8 and get backports. You only lose anything if you're tied to some minor version of EL for some reason.