This should not be related to Anglo-Saxon or Continental Accounting.

 Since Odoo 17 there is a new option in the Accounting Settings:

The Automatic Accounting option is new (in Enterprise Edition).

• If you don’t select this, you will not be able to enable Automated Inventory Valuation in Product Categories.
• If you do select it, a list of default accounts is displayed and you can enable Automated Inventory Valuation in Product Categories.

In Community Edition there is a new user access group to enable Automatic Inventory Valuation:

If a user is added to this group, the Automatic Inventory Valuation option is available for Product Categories:

Inventory postings and valuation (Odoo 17)