Currently in Bedok, there are 10 services that go to the west,
ie. 7, 14, 30, 32, 33, 66, 196, 197, 506 & 608...compared to 3
services, ie. 10, 65 & 67 in Tampines...and none in Pasir
Ris.
I think the reason why more east-west services are in Bedok is
because the routes will be made longer if they terminate further
east. That's why you see lesser in Tampines and none in Pasir Ris,
unless express services are introduced there. (eg. former express
505)