You said before that you wish they replaced the RBS with mortar instead.
I think we have KAPA for that role. While not only can delivered howitzer the kapa also can ferrying 2 mortar team along with the howitzer it self (I am not relly sure, some one maybe can add more Possibilitty here)
My point is we cannot decide where we can embark troops. It depend on deeps, tide, topografy and other thing else.
Sometimes It could be in the front of enemy machine gun it self (example, open area like normandy. thats why US and Allied force heavily depending on carpet bombing and bombardment by navy).
While doctrin of beaching operation is start with 'again..' Massive bombardment , TNI AL In this chase dont have battle ship for this role.
from my perpective fitting rocket on this boat is more reliable for providing fire power since we can trust sari bahana and pindad to provided loots of rocket.
You Miss a whole point, this thing is intended to be used by Army, not Marines. Then the Army intended to build Rawa Sungai Laut dan Pantai specialized units, before they are already acquired some KC Boats (the ones looking like CB90), then Arisgator but all of them is not suffice to handle their requirement for fast mobilization is such specific area along with heavy hitting firepower organic within the system. This unit supposed to be the Army equivalent of Mechanized Infantry but for such geography area (sea, swamp, beaches and such) they are intended to build such units in Maluku and Riau Islands provinces first.