I feel like this is going to blow up on users who set the rules wrong, or forget them, and suddenly their intentions of using a 0%-for-six-months credit card pr

I feel like this is going to blow up on users who set the rules wrong, or forget them, and suddenly their intentions of using a 0%-for-six-months credit card promo accidentally gets assigned to the debit component and drains their everyday funds. I desperately don't want my phone as a payment device. It's fragile, prone to running out of battery, and likely to be full of random software just waiting for the inevitable failure of whatever magic Secure Element design is supposed to save us all. We were this close to a card with a tiny e-ink screen that said "Chase Debit: Balance $232.45" on it, with buttons to toggle between accounts, which you could probably power for five years off a CR2032 and maybe a calculator-style solar cell, and that's what I actually want.