Recently, I had the pleasure of flying Turkish air from Istanbul to Athens (fairly short flight).
The plane was an Airbus A320 according to the seatback pamphlet. It was an average medium-size jet (not a jungle jet). Two observations:

What passed for first class was exactly the same as coach - 3 and 3 seats in each row. The only difference was the little curtain defining the "cabin". I don't understand who would pay any extra for this.

But the bizarre thing was that each middle seat (in both 'cabins) was the same size as the window and aisle, which were pretty narrow to begin with, but the space between the armrests of the middle seat could not have been more then 12 inches. No person could possibly fit in these seats, unless perhaps a very young child.
What could possibly be the reasoning behind this?