Agreed - the W&C stock has recently been refreshed, and I'm sure this is what will happen to the Central line stock at some point in the next five or so years.
You could put the 67 stock through a similar extensive refurb programme, but I think the seating would need to be changed to the 92 stock layout anyway (as happened to the 73 stock on the Piccadilly line).
Passenger comfort for seated passengers in the 67 stock is better, yes, with more deeply padded and a few transverse seats, but if LU really wanted to provide more comfortable seats in the 92 they could. Overall the 92 stock allows more people to board, which given how busy the line is must be the key priority. It's not just one's backside that measures comfort!
You could put the 67 stock through a similar extensive refurb programme, but I think the seating would need to be changed to the 92 stock layout anyway (as happened to the 73 stock on the Piccadilly line).
Passenger comfort for seated passengers in the 67 stock is better, yes, with more deeply padded and a few transverse seats, but if LU really wanted to provide more comfortable seats in the 92 they could. Overall the 92 stock allows more people to board, which given how busy the line is must be the key priority. It's not just one's backside that measures comfort!