For routing nodes splicing enables some cool liquidity management options.

By resizing channels you can move extra onchain funds into a valuable channel as well as move funds out of a less valuable channel.

You can even do both at the same time, moving funds between channels and there’s essentially no limit on the number of channels you can do this to at once.

And it’s all in the most efficient method possible (a single transaction) without relying on any central coordinator.