It is not merely aesthetics, ugly though they are - it is a question of design and functionality. For example the insufficient security hall capacity, having to queue in the stairwells to board, the long queues up to the Gate 10-14 area where you can have 700 people trying to fit into the same area as a tennis court. There are far better designs out there that allow for passengers to be scanned through the gate and then to wait in relative comfort prior to swiftly boarding across the ramp - think Schipol or the satellite stands in Lyon. If there is redevelopment I hope the airport closely works with Jet2, easyJet and Ryanair to deliver a design which works for the way BFS is actually used.