A relatively simple proposal can help improve both the Lightning Network's payment success rate, but also one of it's worst privacy short comings.
One of the fundamental limitations of the Lightning protocol is how payment routing is handled and accomplished. It is entirely source routed, meaning that the sender of a payment is the one who constructs the entire route from themselves to the receiver in order to facilitate the payment.
The ultimate cause of these problems is the inability of a route to change mid-payment without the involvement of the sender. Because the entire payment route is onion encrypted, this is not really possible to do. Each hop is only aware of the hop before it, and the hop after it, they have no knowledge of the ultimate destination to enable them to construct an alternate route from them to the receiver.
If widely adopted as a standardized behavior on the network this could have a huge positive impact in the success rate of payments, drastically improving the UX of Lightning users looking for a simple payment mechanism that just works. It's an incredibly simple and logical behavior that could significantly improve a well known shortcoming. That's not all it can do though.
Lightning is constantly framed as a privacy tool for transactional use, but the reality is given techniques like channel probing the privacy in many cases can be tenuous at best without a user being sophisticated in how they interact with the network. One of the interesting side effects of payment splitting and switching is that it undermines probing attacks. The reason a probing attack works is because you can keep probing with different amounts until a payment fails.
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