Hi there, @wkde.
I appreciate you for getting in touch with us about the availability of the account number field. I would feel the same way too in that situation if there's a missing feature.
I found the related post you're referring to about the suggested workaround. For the feedback, I suggest you mention @JustineCUE from the other thread.
Here's the link: https://quickbooks.intuit.com/learn-support/en-us/other-questions/re-adding-customer-client-account-....
This way, he or she will be able to provide feedback about the suggested workaround. Also, please know that I appreciate your input on this feature.
We always update the features in the product, and this preference might be available in the future. As we assess this, I suggest you visit our QuickBooks Blog to stay updated with all the changes that are being made.
Also, I've attached an article you can use to update customer information in QuickBooks: Edit customer information.
Drop me a comment below if you have any other questions. I'll be more than happy to help. Wishing you a good one.