Many folks during that time period were moving around, you are suggesting that if the parents and the children of that person have known locations that are the same (grandkids in the same place as the grandparents), we should assume the profile in question has the same location for birth/death? Or some other method.
I have a great-aunt who might disprove that theory, as well as a number of other hypothetical possibilities (death via armed conflict that often has nothing to do with birth location, parents could have been living somewhere else for a time when they had children, then returned to their point of origin before expiring, etc.)
If they are sourced, the source should give us some indication of a location. Marriage certificates often list location of birth, birth certificates will of course, issuing authorities should be used, etc.