For the average user yeah, a printer watermark isn't really that big of a deal. But if you plan on printing anything that might cause people to want to target you, whether for political, religious, social (etc.) reasons, then it's a good idea to know exactly what your printer is doing behind the scenes and how to defeat it.
Or reverse that. Maybe you want to leave a trace for whatever reason. It's good to know which printers have this feature.
I think it's good to have a working knowledge of how our gadgets are "spying" on us. Not necessarily for protection or even for privacy, but so we can have the choice of opting in. I think it's ridiculous that such tracking systems aren't made known openly.
One might argue that such secrecy is necessary to make it work, otherwise the bad guys will defeat it. I say that's a load of crap.
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