Currently org and account level variables only allow one fixed value. Allow list is not supported.
We have several variables which are used across Org and Accounts. A good example is list of business units, serviceteams.
Without this feature we are forced to create variables with allowlist in each pipeline and keep those variables updated everytime a new value need to be added. Major pain.
Instead the account and org level variable should support allowlist so that you can update the allowed values in one place only, as opposed to updating every pipeline. This is a major pain point once you start using acct and org level variables to its full potential.