Apple doesn't EOL the last OS version when the latest comes out. I think they mean they wait a few months to make sure all the issues have been worked out.
My work laptop is stuck on 14.3 for a few weeks until they fix this issue. So what? Actual security risk is practically zero. Whereas if I update to 14.4 today the risk is that I can't do my job.
Not really an Apple-specific problem, it could hit anyone who supports multiple versions without opening that can of worms of allowing completely free mix&match of fixes and updates.