The difficulties around CentOS 8 involve the sudden withdrawal of official support. Official support window timeframes matter because it gives Linux users certainty that they will continue to receive bug fixes as well as patches for CVEs and security vulnerabilities that emerge.
The official support for CentOS 8 will be curtailed by almost eight years – with endoflife now on Dec 31, 2021 rather than the originally promised May 31, 2029.