I guess, it just a matter of time that 3-4-3 config in Y will be the norm than the exception.
PE will soon become another standard than exception. soon you will see another 3 classes again. C, PE and Y, instead just C and Y. Then C will be "upgraded" to be like current F and PE will be upgraded to be like current C. Then airlines will start removing C as people are just fine with PE.
You see the cycle?
What is for sure Y is getting more and more cramp
