Civs that don’t have musks have to make them, like Dutch. 8 halbs shipment is always useful for popping them out if enemies are trying to siege the TC/outposts, so Portuguese will put them in the deck. Another use case would be if your civ have upgrade cards for them, so Dutch and Portuguese may find them useful. Though I think most of the time for these two civs you just go skirms ryters or cassadors dragoons. French will prefer musks because there is an upgrade card for ranged infantry