As far as a large organization is concerned someone such as HOTAC has to design the C&T programme, tailor it for the operation and CASA appeasement, work out what to do with the 'outliers' and manage the check/trainer standards.
The HOFO has the uneviable job of sitting between the requirement of the company's business interests, pilot group, unions, and CASA and all the conflicting interests and requirements of each.
In organizations Ive worked for the above are also available to contact 24/7 if a situation dictates, and judging by the hours some emails get sent I'd certainly say its a job that follows you home.
As others have said, there are good and bad ones out there but someone has to be the boss and I sure as wouldn't want to do thier job.