It is neither good nor bad: the interface is exported and public, so you're free to use it.
Since you say getting values from the stack, you should note that the args interfaces describe inputs, and getting implies outputs. There may be cases where not all inputs are available as outputs, so you may get some unexpectedly undefined values. For example, the subnets values for awsx.ec2.Vpc is not available as an output (iirc?).
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