I never would have though a topic about "for reference only" would have more drama and passion than a Spanish soap opera! I had to give my two cents.
I fall into the crowd that thinks that "reference only" labeling is not only acceptable, and has it's place, but that it's actually a good thing to have to eliminate the possibility that someone will pick up a gauge that IS NOT AND WAS NEVER intended to validate CRITICAL MEASUREMENTS being used for that very purpose.
I'll explain further. In my plant, we have to verify part dimensions are conforming to customer requirements. For this, we use nicer, calibrated equipment as a matter of course, ALWAYS.
We also have routine tooling fitment changes, and produce in house tools that are not held to the same criticality as customer requirements, but all the same, need a level of accuracy. For these types of measurements, we have "reference only" equipment. I really don't want to send my 12" calibrated Mitutoyo calipers out for a romp in the machine shop to measure the length of a machine shaft being built.
It's not as if our "reference only" equipment isn't ever verified for it's accuracy, but I do not want to take the time to add it to my calibrated equipment since it's intended purpose is as a shop tool, and as such, is subject to more loss and breakage than devices that don't leave the QC room.
I think it's rather brash to assume that the use of "reference only" is intended to get out of calibrating, or fool an auditor. The standards are written how they are because every shop situation is different, and they are written with a good faith intention. If certain business owners are using "reference only" as a way around the standard, I can only imagine their entire QMS will reek of a company that is only going through the motions, and has no interest in using the standard to their benefit, or that of their customers.
I honestly hope that I have provided a non-unique situation that explains why "reference only" would be used, and why it exists to help PREVENT non-conforming product from getting through. Just my opinion and practices.