Some food for thought as I read the discussion—one thing I’ll throw out there having cards across a few banks and networks—for most recent merchant agreements, Amex isn’t always the most expensive to process (at least in the US, which is at least the concern since the Apple Card is a US product and I’d guess most transactions happen here.)
As Visa and Mastercard have “honor all cards” agreements, that means a merchant has to accept all Visa cards or all Mastercards, regardless of tier. The plain versions are often cheaper to process than Amex, but when you start getting into tiers like Visa Signature, Visa Infinite, World Mastercard, or World Elite Mastercard, costs can be more than Amex (so basically a wider range)
https://www.fool.com/the-ascent/research/average-credit-card-processing-fees-costs-america/. This is why so many banks are “upgrading” people to higher tiers (Visa Signature used to require at least a $5k limit, now some banks are issuing them <$1000). In fact, Apple Cards seem to be World Elite Mastercards behind the scenes, even if we don’t get all the WEMC benefits:
https://www.macobserver.com/link/apple-card-mastercard-elite/
I saw a story on another forum about someone who typically uses an Amex, but if any shops push back in a crappy way, he pulls out a Chase Sapphire Reserve (a Visa Infinite) to be petty. I don’t necessarily agree with the tactic, but Visa and Mastercard have kind of stealthily changed their game over the years.
Amex’s OptBlue program also helps small businesses get a better rate:
https://www.americanexpress.com/us/merchant/optblue.html
Nonetheless, like many, I totally get the gripes about a network switch to something smaller (even Discover is bigger in the US, almost on par with Visa/MC), not to mention that would remove my go-to “works everywhere” card. Outside of the US, it will be a major downgrade.