Lutheranism and ecumenical discussion: an explanation.
Not to sound like an Eastern Orthodox apologist, but the western church often sees individuals afflicted with something I like to call lawyer brain.

Lawyer brain is an affliction that processes perfectly innocuous words through a wooden, literalistic, pelagian filter, turning perfectly normal ideas into tortures of conscience.

A prime example of this could be the canon that every christian should go to confession and confess all their sins once a year. If not taken too woodenly, or literally, or pelagianly, there’s nothing wrong with this canon.

Lawyer brain, given this canon, becomes completely paralysed by the overwhelming burden of listing literally every sin one has committed in the past year, on pain of hellfire.

Luther had one of the greatest cases of lawyer brain ever seen on earth. He defeated lawyer brain by finding a way of speaking theologically that is immune to lawyer brain.

Unfortunately, he did so by infecting literally every Lutheran with lawyer brain.

This is why Lutherans, when discussing theology with anyone else, will have an allergic reaction to words and phrases that other traditions will think are perfectly innocuous, such as worthy, merit, cooperate, act of contrition, free will, etc.

Is this some sort of fatal flaw? No, but we do have to be aware of this when talking to our brothers and sisters in Christ.