Comment by SubjectToChange

God forbid you used cgroupsv1 for anything when poettering unilaterally decided to punish everyone with a 30 second delay for using it.

Intentional time-delays are a nice middle ground. Yes, it is annoying to the users who've ignored all prior deprecation warnings, but it's better than those same users being "surprised" when support is removed entirely. Maybe you'd consider it less of a "punishment" if systemd dropped support for cgroupsv1 outright instead of inserting a time delay, I believe the opposite.