Yes, you can say "well said" in response to something written. It conveys your appreciation for the clarity or impact of the writer's expression. Alternatively, you might use phrases like "well expressed" or "well articulated" to specifically acknowledge the written format.
You can say "well said" to acknowledge that someone has articulated their point effectively or made a compelling argument.
"Sakka."
Ylvis
an efficient writer.
no problem = kein problem
Pisatel' Писатель
We say that they are partially mobile. They are not fully articulated like a hip or an elbow, but neither are they fused like the skull joints.
Is he not exclusively a writer?
I'd say Voltaire
analysis.
pisarz (female: pisarka)