core: "az configure -d group=foo" doesn't apply when the group is an optional arg in the command

I’ve got three different sites in three different resource groups:

~/.azure$ az appservice web list -o table
DefaultHostName                 Name          ResourceGroup    State    Location    AppServicePlan
------------------------------  ------------  ---------------  -------  ----------  -----------------
paluffopizza.azurewebsites.net  paluffopizza  paluffopizza-rg  Running  West US     WestUSPlan
springqbr.azurewebsites.net     SpringQBR     QBRDemoRG        Running  West US     thermocloud2-plan
thermocloud2.azurewebsites.net  thermocloud2  thermocloud2-rg  Running  West US     thermocloud2-plan

I want to use the new configure --defaults option to default the resource group, so following the docs here: https://docs.microsoft.com/en-us/cli/azure/#configure I did the following

~/.azure$ az configure -d group=paluffopizza-rg

Now my expectation is that whenever I run a command i can omit the resource group and it will default to what I have configured. Instead, I see all of the sites:

~/.azure$ az appservice web list -o table
DefaultHostName                 Name          ResourceGroup    State    Location    AppServicePlan
------------------------------  ------------  ---------------  -------  ----------  -----------------
paluffopizza.azurewebsites.net  paluffopizza  paluffopizza-rg  Running  West US     WestUSPlan
springqbr.azurewebsites.net     SpringQBR     QBRDemoRG        Running  West US     thermocloud2-plan
thermocloud2.azurewebsites.net  thermocloud2  thermocloud2-rg  Running  West US     thermocloud2-plan

What i expect to see is the same thing as running this command:

~/.azure$ az appservice web list -g paluffopizza-rg -o table
DefaultHostName                 Name          ResourceGroup    State    Location    AppServicePlan
------------------------------  ------------  ---------------  -------  ----------  ----------------
paluffopizza.azurewebsites.net  paluffopizza  paluffopizza-rg  Running  West US     WestUSPlan

[tjprescott]

You could make the list commands accept --resource-group * to list all within the subscription. That wouldn’t require much more logic but still allow you to use the default RG.

[yugangw-msft]

@chrisdias, Agreed it is a ui gap. The arg description is not correct here.