Except that Lutherans ARE Protestants as well as Anglicans, Methodists, and a few other liturgical churches. This would seem to conflict with your thesis.
Yes they are Protestants. How does that conflict with my thesis? You do not make sense to me. The delivery is not important. Each group is influenced by the culture it serves. Which is why Catholic/Orthodox have ancient Jewish worship formats that were replaced and re-ordered with Christian themes (Communion, confessing sins, sharing in a meal, ect) , while having pagan dates for many calendar events.
Protestants (some with liturgies, others without liturgies) are structured either similar to the Catholics, or have a speaker with a congregation of listeners, as this style was the same method that debaters utilized in the age referred to as "The Enlightenment".
Most major organized Christian institutions often argue among themselves regarding this because they've slowly drifted away from the purpose of Christianity in many ways.
I think of this text when contemplating this topic:
From 1st Corinthians
"And to the Jews I became as a Jew, that I might gain Jews; to them that are under the law, as under the law, not being myself under the law, that I might gain them that are under the law;
to them that are without law, as without law, not being without law to God, but under law to Christ, that I might gain them that are without law.
To the weak I became weak, that I might gain the weak: I am become all things to all men, that I may by all means save some.
And I do all things for the gospel's sake, that I may be a joint partaker thereof. "