I'd be glad to share some information about the QuickBooks feature to help you decide what's the best plan for you, JRGB.
The link you provided above is the only available complete list of QuickBooks program features.
Moreover, the expense categories and sub-categories option are unavailable in QuickBooks Self-Employed. This feature is only available in all QuickBooks Online (QBO) versions.
In addition to this, you can also check out this article for more details about the feature comparison of the QBO program to QuickBooks Desktop: Product feature comparison for QuickBooks Online and QuickBooks Desktop.
I'm only a post away if I can be of additional assistance or need more help with QuickBooks. I'm always here to help you out. Keep safe!