Why aren't three part references supported?

[MartinHughes-BPC]

I have a fairly complicated multi-database setup. As a matter of course I always set a model's protected $table to the three part table identifier, eg sales.dbo.orders as this allows for cross-database relationship querying, amongst some other benefits in SQL Server such as cross-database transactions with the same connection. This has worked flawlessly since Laravel 5.8.

However, if I try to run some newer commands, such as:
php artisan model:show User

I get an error:
"Using three-part references is not supported, you may use Schema::connection('{$segments[0]}') instead."

Thrown in Illuminate\Database\Schema\Builder parseSchemaAndTable method.

My question is why aren't three part references supported?

Cheers,
Martin.