1. The location. Subang is adjacent to PJ and along the line to KL.
This is the main factor why it is easier to boom. Im not saying "everyone needs KLCC"...The point is KL will be always become spine of the klang valley hence the KL checkpoint
2. Entry point are diff. This is not elmina issue. This is back to the salary vs affordability. Subang rises are proportionate with the growth of the places from 70s to atleast for the past 20 years.
Elmina..entry point already upper m40 already. Sure there will be selangorku projects here and there but i think u got what i mean
3. SD brand for elmina. Needs more brand and surely SD wont develop the rest. More time needed.
Kota kemuning despite being "matured area" i dont think people will equates is as subang. Diff segment and apple to compare but the growth still need atleast 15-20 more years maybe? I dont know. A simple threshold is rail line.
With the demand of rail line outsides of KL is now increasing ...whichever the govt of the day later will have to push ideas of rail line outside of Klang Valley.
Subang was blessed with KTM line at the very early days and now with additional LRT lines after around 2010ish...
They build their own business district and corporate HQ, built big mall and industrial park that they able to boom and sustain
Newer example is Setia Alam
Elmina issues is that they are built by leeching into Shah Alam infra and economy with narrow highway artery connected to it and thus the reason why I feel it will not grow much