HK bus services are structurally different from ours, much more
routes with express sectors. even those without express sectors do
not stop at every single bus stop along the road, saving time. the
distance between bus stop here is too short, adding unneeded time
to both the service runtime and commuter journey times. (are
singaporeans so damn lazy to walk they need bus stops every
200-300m???)
back to the point, most of their services are in such a way that
the first half of the bus route is when commuters board and then
the second half is alighting, hence their fare structure. eg $2
fare if you board at any first 6 stops, $1 fare for next 6 stops
and $0.50 for next six stops (very short sector near terminating
point, not much people will board). so not much turnover and no
problem of double deck buses stoning at bus stops because of a huge
amount of people boarding and alighting at the same time, generally
its either only boarding or alighting at a bus stop.
also, hong kong doesn't have many routes that are structured in
a way like our 'feeders' with have high turnover rates at every bus
stop. residential estates are adequately served by MTR and trunk
services that pass through the estates, including variations of
trunk services that are specially diverted into estates during peak
hours. there is no extreme centralization that our transport system
suffers from, pumping all passengers from trains and trunk routes
into feeder routes that can barely cope. (hub and spoke) just think
of two huge canals chanelling water into one small drain.
a radical change in our bus routes' structures is needed if we
were to entirely ditch bendies for dds.
i think most people who have gone to HK will understand what i
am trying to say about the way their routes and systems are
structured 
A revamp to bus routing is long overdue. Many of our routes are
designed long ago when the goal is to maximize fare revenue and
coverage, with little regard to reliability and the time taken to
travel between A and B (efficiency of routing).
You know it when passengers are willing to pay express fare to
ride for 3 stops within the same town to attend school.
