The Tilt is fussy and does require careful calibration against a "real" hydrometer in many cases. If your Tilt is reading perfectly, then you are simply lucky. Many other people including myself have not been so lucky. While with proper calibration my Tilt reads reasonably accurately for the most part, in cases where a lot of yeast and hop matter become stuck to it at middle or end of the fermentation cycle, the Tilt can read pretty far off actually, by I would say as much as 0.004-0.005 or thereabouts, in my experience. I am a scientist and I love mathematics and spreadsheets, etc., so I'm not just guessing or imagining. I KNOW this effect is real.
All this being said... I agree with at least part of what you are saying. Yes, the Tilt is a "real" hydrometer. But any real hydrometer was never really intended to read accurately when a lot of gunk is stuck to it. Only in an ideal environment can it be expected to read very accurately. And this is true for OG readings. The OG readings should be accurate within 0.002 if not 0.001 versus a "real" hydrometer. And this has been my experience. Only later on in fermentation does it drift a bit.
Personally I am an advocate of periodically rocking the fermenter in an attempt to knock much or most of the schmutz off the Tilt to get it to read more accurately, and I have seen this help quite a bit. It doesn't always work, but sometimes does. So I do rock my fermenter about twice per day during mid and late fermentation.
You don't have to agree with me, but hopefully this sheds a little more light on someone else's experience with the Tilt to help you to understand why people do or say what they do. I love my Tilt, it's a neat toy. But I also know it ain't perfect. It's a tool, and like so many things in this world, tools are about as useful as the people who are using them.