I can see how the benefit of being able to delete a payment method (credit card) used for your subscription would aid you in managing your QuickBooks Online (QBO) account, @CelestialMochi. That's why I'm here to share a few details about this.

You're unable to delete a payment method in QBO for transaction history purposes. With this, you're able to track all your subscription payments.

We take customer suggestions as opportunities to improve the various features within our products. Therefore, I would encourage you to send suggestions or product recommendations.

Your valuable feedback will be forwarded and reviewed by our Product Development team to help improve your experience while using the program. Here's how:

1. Go to the Gear icon.
2. Select Feedback.
3. Type in your recommendation in the Share your feedback field.
4. Click Next.
5. Follow the on-screen instructions to complete the process.

I've attached screenshots below that show the first four steps.

Also, to further guide you in managing your QBO account, whether you need to update the card on file, change your subscription, or view your billing history, you can refer to this article: Update billing, payment, and subscription info in QuickBooks Online. It also includes answers to the most commonly asked questions about it.

I'm all ears if you have other account management concerns in QBO. Please don't hesitate to drop a comment below, and I'll gladly help. Take care, and I wish you continued success, @CelestialMochi.