Kowloon has a population density of 46,010 persons per sq km (6
times that of Singapore), HK Island has a population density of
15,990 persons per sq km (with much of that going to bungalows
built on pockets of uneven terrain), with leaving a spacious 3,930
persons per sq km in the N.T. There is less usable land in Hong
Kong than the whole of Singapore, and even fewer are truly flat
grounds. That explains the popularity of point blocks, which makes
it easier to build since you have fewer issues of uneven terrain to
contend with for each building.
And even with 3,930 persons per sq km, Yuen Long routes like
68M/968/68X/268C could come once every 4 to 8 minutes during peak
hours, fill to the brim within a couple of stops and head out to
the expressway. To support express bus services, you need that kind
of density. There is enough demand to operate FFw-style peak routes
like Rt.268X which skips Cheung Sha Wan and Sham Shui Po. On
weekends where demand is lesser, Rt.268B runs express to Tsim Sha
Tsui once every 30 minutes.
Rt.260X sees brisk business competing with the MTR WRL for
travels between Tsim Sha Tsui and Tuen Mun (with long queues to
boot at nights) while Rt.269B offers an alternative for those who
do not wish to have to transfer to the LRT system.
Your point was obviously lost on the fellow who "replied" to you
earlier.
Sad but expected outcome really.