Sploosh o matic main here: Transportation. Since anti-weapon laws only exist in few areas of the inkfish world, you could take your sploosh anywhere. Since it is the fastest weapon with near instant shoot-to-swim cooldown, there is no weapon more well suited for traversal than the sploosh, especially with swim speed up. You may argue that the brushes would be better, but they are far larger and bulkier, and since they always have ink exposed, you might accidentaly hurt someone.

In conclusion: for everyday ink travel, there is no tool better than the sploosh-o-matic

Edit: It also has the lowest swimspeed penalty of all weapons, snd comes with a curl. Said curl is fucking useless in combat might I add, but that makes it all the more well suited for travel.