It was one of the tools that allowed me to maintain healthy credit card usage habits. In my idle time when messing around on my phone I’d gotten into the habit of just transferring money from my checking account to my credit card, often in excess of my actual balance, so as to cover “pending” purchases.
Not only will my bank no longer let me do that, just to twist the knife a bit, they will let me make multiple payments totaling the pending total due so long as no individual payment exceeds my actual balance.
So it’s not that they can no longer handle negative balances on the card, it’s just that they’ve half-ass made the interface disallow it.
Bugs the shit out of me when companies make it difficult to use their product. I do the same thing as you. I enjoy having $0 balances on my credit cards, and I use them within my means, so I pay them off straight away throughout the billing period. One of my cards (I only have two) makes it really difficult to pay off my balance more than once a month, and they delay those “extra” payments by days, sometimes weeks. I called them out on it and they said “just pay your balance once before the due date.” Fuck that. My other card lets me pay off my balance instantly, whenever I want.