I don't think pax are choosing to avoid pier B seating of their own choice. The airport wishes to maximise retail income which requires keeping pax in the shopping area for as long as possible... screens showing gates across the airport deliberately discourage people from leaving the shops until about 45 mins before expected push back (and a delayed inbound means a gate isn't advertised until later).
Furthermore, it is not really in the interests of tge airport to provide many seats around the shops. Seats take up space where another retail unit could be, and pax who can't find a seat end up wandering around the shops to kill the time (and often spending money !)
Yes elderly, disabled and vulnerable people need seats, but why would an airport really want to provide more than the absolute minimum number of seats near shops or direct pax to area away from shops any earlier than necessary ?