Archetypes can only speak from memory. Archetypes are unable to freshly mint phrases or sentences.
So Archetypes only speak in cliches.
And as almost all of Typology Central is conducted in cliches, so all we hear are the voices of Archetypes.
If we wish to speak in our own voice, we need to freshly mint our phrases and sentences. Fortunately English is tailor made for this with 1,025,110 words in English with an almost infinite number of combinations and permutations.
So we only have to listen to our own cliches to discover which Archetype is speaking, or we can freshly mint our words and speak in our own voice.