Frankly, I find it a bit odd that the IN is working on integrated mast only for comms+esm at a time when multi-function masts are becoming standard around the world. Ships like the French FDI class combine radar, ew/esm, eots, comms, etc in one single mast. The only exception I can think of is nav radar and perhaps CIWS.
I get that we've historically preferred redundancy in the event of battle damage. However, small ships can certainly use the extra space for weapons, supplies, etc. Unless there are emi/emc, topside weight or stability issues we don't know about.