the biggest problem is if one of these operations ever takes over 24h you'll end up with multiple scans overlapping and sharing CPU/IO load, slowing them down, spiralling into resource exhaustion.
these can be turned off system-wide by setting the security_status_chksetuid_enable and security_status_neggrpperm_enable rc.conf vars to NO in the Tunables tab, or you can manually add those overrides to /etc/periodic.conf on a per-jail basis if you just want to turn this off for specific jails.