These are the problems listed in the release note:
Firmware 2.018/2.019 :
• This firmware update fixes the drive’s handling of infrequent power glitches which can cause data access issues.
Firmware 2.010 :
• Updated to meet the latest storage compliance (SBC3 and SPC4).
Firmware 2.003 :
• European Union Power Savings Support.
Firmware 1.032 :
• Initial release of the WD SmartWare VCD Manager for Windows.
Maybe do you know how a customer can verify if his device has any problems?
Your reasoning is correct as long as WD explains what devices have problems, Smartware advices me about an available firmware update but finally drive isn't upgradable, why? WD is not clear about this.