The verse, Romans 2:13, is repeatedly beeing used as proof text that someone is a doer of the law and so then is justified by the law has totally missed the implied condition of justification by the law, doing and not just hearing the law. That is,
If anyone meets that condition, that is a doer,
then he will be justified.
Yet, Galatians 2:16 says, "...by the works of the law no one will be justified," So then the conclusion is that no one has, does, nor likely will meet that condition to be a "doer of the law."
And Romans 3:20 confirms this, "20
Therefore no one will be justified in His sight by works of the law. For the law merely brings awareness of sin.
Seems to me that it's better to be a "seer of the law" for what it 'shows' us, in God's
sight. And then one might actually also
see just how gracious God actually was is and will be.