Greetings,
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Any kernel device drivers, for a start. Kind of critical if your SAS/RAID device wont boot, or your network device doesn't come up, or your GUI doesn't start because your display drivers aren't compatible anymore. Just minor things like that maybe?
If RHEL 8.4 works, and CentOS Stream 8.4+ makes a change that breaks something... that's what is going to become RHEL... so does it matter THAT much if it breaks a month or two earlier than in the past? Now answering your question with a question, how about another? Did you have much breakage as a result of EL minor updates? I assume the answer is no... and if no is the case, then you shouldn't have much breakage with Stream.
TYL,