The reason is not to save cost, if they want to save cost. The
current system of masking tape T plates are better than the small T
now. Which even saves more cost. The reason is the way of BCs
putting the T plate are damaging the bus body, that's why they
changed the system.
And those oversized plates gets caught on doors, spring up and
hit commuters in the face or they themselves get fractured. xD