I appreciate you for sharing your experience with us, @vaughan3.
I understand the convenience of using the old formats in QuickBooks Online (QBO). However, I'd like to ask for further information about what specific formats you're referring to.
Currently, we're rolling out a new experience for estimates and invoices to introduce new features. The improved experience will allow you to customize and manage them faster on the go.
In the meantime, I suggest forwarding your feedback to our product developers to improve your experience using QBO. Here's how: