Improve the Singapore MRT system

I am impressed with the following features of the Taipei MRT system:

a) Good signage
b) Helpful staff
c) Short waiting time
d) Easy to get a seat, even during busy hours

These are conditions that are easy for Singapore MRT to achieve, even though the system is older. What cannot be done through hardware can be achieved through software.

What is needed to get the Singapore system to be less crowded?

Operate more trains. The waiting time for trains during off-peak period is now between 5 to 8 minutes. If the waiting time is reduced by 1 or 2 minutes, the capacity can be increased by 25%. This will impose a small increase in operating cost but a big reduction in waiting time and 25% more people can have a seat.

I accept that during peak hours, our MRT trains are already operating at full capacity. But, we can make the system more comfortable during the off-peak hours, like in Taipei.