> I understand this is instead of the 2% cash back that Apple Card pays on full payments.
That would reduce the appeal a little. And that's different than their own-store policy on their card -- if you buy from Apple with an Apple Card on the installment plan, you get the 0% for 12 months or whatever, and you get the 3% cash back too.
Thanks for the 2% comment, by the way. Made me go look, since I only recall it being 1% (for most things). Turns out it's 2% whenever I use my Apple Watch to do the transaction. Works for me!
I assume the merchant fees are the same either way.