I appreciate your input from every angle, CS2021. 

You can use our Custom Form Styles feature to make several invoices email templates. From there, you can manually input the specific subject and content of the email to state the client/customer name in the subject line in the Custom Form Style Settings. 

Though, I understand how the workflow you're looking for is beneficial to your business. To ensure your voice is heard, I can pass along another feature request on my end. 

The more request this gets, the more likely it'll be part of future enhancements. We always value customers who are keen to give us their feedback. I’ll be sure to follow-up on this matter with our managerial team. This way, they could come up with the appropriate course of action to improve QuickBooks as soon as possible.

For the time being, you can visit our blog and sign up to our Newsletter. This way, you’ll receive email updates about new changes in the product. Our developers get inspiration from customers, so your voice makes a huge impact. 

Please know that our doors are open for any additional concerns about QuickBooks. Just leave us a message below, and I'll ensure to take care of them. Stay safe!