Why integrated composite masts are spreading

Why are more navies adopting composite integrated masts like those offered by Saab Kockums?

They offer a combined equipment package and a possible upgrade path through later mast variants from the same supplier.

Integrated masts offer a package of equipment that can be bought and installed as a unit. Choosing a supplier's mast can also make a later replacement with its next variant attractive. Japanese and Saab Kockums approaches are discussed as examples of growing interest. Multiple integrated masts on one ship are raised as a possibility, without a settled layout or explanation of why a navy would choose it.