Unix/Linux Access Controls: A tale of four audiences

UNIX and Linux Administrator I am worried about not being able to log-in to do my job if Active Directory is not available I am concerned that the integration with AD will be very intrusive to my Unix and Linux systems I am concerned that the privilege management model won't allow me to do things as root when I require it. I am concerned that I won't be able to leverage scripting and automation I'm spending a lot of time to produce information for security attestation I'm concerned that each time I need to do something I will need to go to the Windows guys for permission. Do I need to go changing file ownerships (chown) once this is implemented?

Active Directory Administrator I'm concerned that this solution will require to extend the AD schema I'm concerned that I will need to run services in Domain Controllers I'm concerned that the agent will eat my DCs CPU and Memory with multiple persistent LDAP connections  I'm concerned that now I will have more work since I have to help the Unix group.

Security Analyst I need to make sure only the right people can access the Unix and Linux Systems (least access principle) I also need to make sure that shared accounts (like root) are only used when required I need to make sure accountability is increased I need to make sure people can only have the privileges that they need (least privilege principle) I need to satisfy audit reports and close open audit comments We need to align with Regulations (SOx, HIPAA, PCI, etc) I am not sure that we can really pin-point who did what at a certain point (bad change control, data-breach, etc)

IT Manager or IT Architect I am concerned that we're spending a lot of money in point solutions I'm concerned that the project will not yield results on time I'm concerned that processes like password resets, provisioning, de-provisioning, and attestation are very complex. I'm concerned that any new solution is going to require a ridiculous amount of infrastructure. I'm concerned that even though we have top of the line solutions, it seems it takes a long time to get stuff done.