I guess I see some parallels in my role as a school-based PT. I have become very much functionally and "top down" oriented in my assessment and interventions, since I have limited time and resource to provide my service. Over the last 8 years or so, I have become increasingly involved in sensory assessment and treatment as part of overall management for students with Asperger's.
Surely ergonomics and work capacity assessment are not the exclusive domain of occupational therapy? I say, enjoy your job and hold your head high!
Regards, Paul