the key differentiator in Singtel's 5G+ is the network slicing technology. this allows certain traffic to be prioritised, and thereby letting Singtel provide a better experience for those who're paying more, on paper anyway.
the thing about mobile networks it that coverage is often a bigger issue than congestion. congestion would be a problem when everyone is gathered at Marina Bay Sands for the fireworks display, all eager to stream their video live on social media. everyone's phone has a perfect signal because they are in the heart of the city, but if you pay, your data gets to go through first.
in most instances, however, it's more more important for mobile users to not have dead spots where there's no signal (underground, for example, or remote army camps) - hence, better coverage.