CLINK author here, I like keysend, its actually been one of my arguments against Bolt12... Bolt12 should have never happened, add that to the diagram and CLINK is dead simple by comparison. Couple limitations though with keysend that CLINK addresses though: 1) Web friendliness, if Lightning is to be the money on the web it needs to work in websites, which nostr does 2) CLINK keys are de-coupled from the node itself, so are available per-user rather than per-node in shared node contexts 3) Arbitrary payer_dater for commerce, product sku's etc in the payload (also receipt payloads which also enable interactivity on webapps)