Hello ODDJim,

Thank you for your feedback! I can definitely forward them to our Product Development Team to let them know. I'd recommend also sending your feedback in QuickBooks Online through the Settings icon, and selecting the Feedback option.

Furthermore, after clicking on Save and send you can still edit the Body of the invoice on the next page and enter your personalized message, and then click on Send and close. 

Additionally, you can always customize your sales form content by going to your Custom form styles section and editing the default template you're using. Here's a link you can check for more details Customise invoices, quotes, and sales receipts in QuickBooks Online.

Drop a comment below if you need more help with QuickBooks Online. Have a great rest of the day!