Any call center is more than adequate for finding Z space.
It's just that I have read a few horror stories on FT about AA agents routinely not being able to see JAL space even if it is appearing on JAL/BA/Alaska sites and even if you tell them to look for revenue space and using Z for F space.
Much like any job in the world, training your staff on changes takes time. I'd suggest not drawing conclusions of current status based on anecdotes from a year ago.