Key difference between my cards...
Citi Double Cash:
Originally Posted by Citi
Effective September 22, 2019, Worldwide Car Rental Insurance, Trip Cancellation & Interruption Protection, Worldwide Travel Accident Insurance, Citi® Price Rewind, 90 Day Return Protection, Damage & Theft Purchase Protection, and Extended Warranty will be discontinued and will no longer be provided for purchases made on or after that date. Coverage for purchases made before that date will continue to be available, and you may continue to file for benefits in accordance with the current benefit terms.
Versus the Costco Visa:
Originally Posted by Citi
Effective September 22, 2019, Trip Cancellation & Interruption Protection and Citi® Price Rewind will be discontinued and will no longer be provided for purchases made on or after that date. Coverage for purchases made before that date will continue to be available, and you may continue to file for benefits in accordance with the current benefit terms.
So it looks like elimination of the extended warranty and damage & theft protection is not 100% across the board, at least for the time being (dunno if it's to prevent Costco from jumping ship to another issuer or if they have a contractually established obligation to maintain certain card benefits for a certain period of time...)