it will definitely spur the east coast states economy.

the main purpose of ecrl is to serve as freight line.

Transshipment is not so much depend on the time or distance between ports, logistic software will handle this. You need a huge wharf, manpower and equipment. It's not like you unloaded from Vessel A and immediately Vessel B is there awaiting for loading and leaving for destination. I doubt storage in SG is cheaper than Kuantan or Pulau Indah.

It's not about transportation from A to B, it's about Transhipment.

What is Transhipment?
Transhipment, at its core, is the process of offloading a shipment from one carrier and loading it onto another at a designated transhipment hub or port. All modes of transport — sea, air, rail, and road — leverage transhipment to consolidate shipments headed towards similar destinations. This system facilitates the creation of more direct and swifter routes for transporting goods.

Without transhipment, the sheer magnitude of the logistics involved in international shipping would be overwhelming, as a direct route to every destination is impractical and economically unfeasible.