Recently, I've been looking into IBC / cross-chain technology again. To put it simply, what you think is just "sending a message" is actually a chain of trust: the light client / validators of the main chain need to be honest, the other chain also needs to be honest, and the relayers in the middle must follow the rules (they don't necessarily need to be trusted not to act maliciously, but you have to trust them not to go offline or block messages). Plus, there are details like timeout mechanisms and ordering. If one link loosens, the experience starts to malfunction. Many bridge accidents are not because "hackers are too clever," but because you trust too many components that are layered on top of each other. Recently, the criticism of staking / shared security being a "copy-paste" has resonated with me as well: before stacking up the yields, you should first clarify "who am I actually trusting," otherwise what you see in the mirror might just be an illusion of returns.