Originally Posted by
resolute
I have had US officials stamp my (US) passport plenty of times in the past - my various passports from over the years have plenty of US stamps in them, so I don't see why it really matters - now I use Global Entry so I never get it anymore because I just hand them the slip from the kiosk - but it seems like passport stamps are really becoming a relic of the past anyway...
I think you misunderstood the situation posed by the OP. he is not asking for his US passport to be stamped on entry to the US, he is asking for his non-US passport to be stamped upon entry to the US.
It matters because putting an entry stamp in the non-US passport implies he was admitted not as a US Citizen but as a foreign national. This can result in significant issues in rare legal situations within the US.