I hate to disagree with you on this matter but I am finding no info in any of the articles you provided or my own knowledge that says that a chip could migrate to an area that would be unreadable. In my profession I have worked in four different vet clinics so far over many years. I have never seen a microchip located any where it should not be during surgery. I have assisted in hundreds of surgeries. I am not claiming to be the expert but I would think that with that number I would have come across something if it were indeed an issue.
The other thing about micro chipping is that I never started that it should be relied on as the sole means to track a lost pet. Micro chipping in no way harms a pet so there is no good reason NOT to do it. There is always the chance the chip will not be detected but there is a good chance it WILL be detected.
My cat that has the microchip also has an ID tag and Microchip tag on his collar that we never take off of him. There is nothing wrong with having that little bit of extra protection if you need it.
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