[Freeipa-users] Different HBAC handling on Ubuntu 20.04

In order to run 'sudo -i' on RHEL-based Distros we are used to allow this particular service via a HBAC rule. A colleague of mine found out that this is not required on Ubuntu 20.04.3 LTS. It seems like that the 'sudo' service is sufficient on Ubuntu systems to run 'sudo -i'. So... here's my question. Why is 'sudo -i' an own service at all? Why isn't this covered by the 'sudo' service? Cheers, Ronald