The PPESASDLB it is!
Oh I agree it is nice it exists and it is a soft perk.
I am just worried the word 'block' will make people feel entitled and we'll get questions like "why didn't the block work for me".
The seat-perk is now more like op-ups. They do happen and status has some part in the equation, but we will never know before getting on the plane what will happen.