SST runs into this issue in the test and send questions in slack channel https://redhat-internal.slack.com/archives/C07P76V6R97/p1762525320145639

1. From system image's perspective, like RHEL guest image, man and mandb should be built into bootc image.
2. From container images' perspective, like ubi9/ubi, man and mandb do not make sense to be included.

bootc image is not just a container image but a system image, so including man and mandb into bootc image makes more sense.