The Stringless is more niche on Childe. While it does not buff his melee attacks like Rust, Stringless can still be viable for damage from his skill. This weapon can also be used to produce large burst damage.

Is stringless good for Childe Reddit?

stringless increases your riptide and your Q burst. JinJinx said that compared to other carries Childe actually has pretty weak damage, but since his riptide triggers on all the mobs and its an aoe ability then he's able to compete.

Does rust passive work on Childe skill?

In conclusion, Using The Rust, the dmg dealt from Childe meele stance increased by 35%, roughly near The Rust effect, which is 40%. Assuming that some DMG is dampened by unknown factor, it's safe to assume that The Rust effect applies to Childe meele stance.