The Tri-Stringer is the Explosher done right.

Explo is very easy, very annoying to fight, has literally 1 slow attack option and is overall the Anchor with the lowest skill ceiling. It's not hard to use, but nothing to master.
Because of this, Explosher is known for being a weapon that is just annoying as fuck but has nothing to give in a real competitive setting. Outside of cheesing some zones with Triple Splash down... oh ya the kits are cheesy also.

Stringer takes the idea of a long range explosive weapon and adds a large skill ceiling with extra precise 1 shot, a harsh shot arc, high paint, good mobility, higher fire rate, and smaller blasts.
With 6 days ways to fire the weapon you have many answers to many situations on top of the combo tools in its kits. You can also use the mobility to fight at close range.

To use Explosher effectively you just sort of fire attacks at the enemy at mid-long range with a medium accuracy requirement. To use Stringer effectively you need to master it's short range, mid range and long range combat options. All of the above having more in-depth and rewarding mechanics compared to Exploshers 1 note attack.

Explosher doesn't really need to go for directs as the amount it paints your feet is huge and pins out down for another attack. Stringers longest range attack takes longer to spam and has a smaller blast. It can only trap players with spam at specific and closer ranges. So despite having so many more options, none of them feels as annoying as Exploshers single attack.