Should we remove vertical tabs from UI when their usage doesn't conform to UI guidelines?

[bugfolder]

The Drupal UI guidelines for vertical tabs (which Backdrop follows) says:

Group subsets of related settings together and put them into vertical tabs, so that only one vertical tab at a time is displaying its form elements.

Use vertical tabs

• when you have a group of form elements that users can safely ignore, such as metadata elements or elements with good defaults; or
• for situations similar to the Emails settings on the Accounts settings page [N.B. this refers to admin/config/people/emails]

...
Do not use vertical tabs for the main interaction in the form.
...

Placing functionality that is part of a certain workflow within vertical tabs is discouraged because the user should be able to skip the vertical tabs.

Current Ubercart usage of vertical tabs violates these guidelines in several places:

• on the Add Product form at node/add/product, the "Product Information" vtab contains many required fields, and the "Shipping settings" vtab contains important information that should be at least reviewed, if not altered;
• On the Store settings form at admin/store/settings/store, all the fields should be reviewed, and some, like store email address, are required;
• On the Cart settings form at admin/store/settings/cart, there are several important (non-ignorable) elements;
• Ditto for admin/store/settings/checkout
• Ditto for admin/store/settings/products

In order to better conform to UI guidelines, we should consider un-verticalizing the fieldsets on these pages. (This would make #424 unnecessary.)

If we do this, a question is, should the resulting multiple fieldsets be initially collapsed or not collapsed? What seems ideal would be to have them initially uncollapsed to make everything visible, but once the user has reviewed a given page, they are collapsed by default.