After Jurong East is the eleventh air-conditioned bus interchange in Singapore (under planning before 201

There's More to Come:
1) Woodlands Regional Interchange twelfth air-conditioned bus interchange in Singapore (under planning before 2020)
2) Sembawang Bus Interchange thirteenth air-conditioned bus interchange in Singapore (under planning before 2020).
3) Bishan Bus Interchange fourteenth air-conditioned bus interchange in Singapore (under planning before 2022).
4) Pasir Ris Bus Interchange fifteenth air-conditioned bus interchange in Singapore (under planning before 2022).
In total of 15 Air-Conditioned Bus Interchange in Singapore on 2022.
So far there's no Joo Koon & Marina South Air-Conditioned Bus Interchange to be built.Why?