See Table 7.6.2 in XJDF 2.1 (similar in 2.0). DeviceInfo was needed n the past to grab @DeviceStatus.
Controller uses KnownDevices to find out the supported devices of the worker and in JDF also got the status of the devices (down, offline etc.).
But KnownDevices response now skips DeviceInfo layer so no @DeviceStatus.
Should Controller then do extra Status Queries for each of the devices he is interested in?
This was part of the "One method for one feature" cleanup.
Essentially KnownDevices now is a pure discovery mechanism: These devices exist.
If you want to know more, then request Status which returns DeviceInfo.
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