At https://w3c.github.io/csswg-drafts/css-counter-styles/#additional-predefined spec says:

The Internationalization Working Group maintains a large list of ready-made @counter-style rules for various world languages in their Ready-made Counter Styles document. [predefined-counter-styles]

These additional counter styles are not intended to be supported by user-agents by default, but can be used by users or authors copying them directly into style sheets.

Is there a reason why these are not intended to be supported by user-agent or should some, or all, of them be moved to predefined styles?