I recognize the importance of having an accurate and clean books for your business, @glasses.

I understand that having this feature available in the system would make your QuickBooks experience better. 

I'd recommend sending feedback to our Product Development Team. We value your suggestions. This way, it helps our engineers determine what features to be added in QBO future enhancements, like deleting a vendor. 

Here's how: 

1.   Go to the Gear icon at the top.
2.   Select Feedback.
3.   Enter your comments or product suggestions.
4.   Click Next.

You can visit this website to track your submitted feature requests through this link: https://feedback.qbo.intuit.com/forums/168199.

I'd also added this article that might help you in handling your vendor transactions, information, reports, and other related topics: Expenses and vendors. 

If there's anything else I can do for you, don't hesitate to leave a comment below. I'm always here to help. Keep safe.