I'm not very good at explaining the grand principles of those "cross-chain black technologies," but these past couple of days, while sipping tea and reading discussions about IBC/bridges, I had one thought: a cross-chain transfer is really just paying a salary to a set of components, and also giving them a chance to take the blame. Basically, you’re not only trusting Chain A and Chain B, but also the light client/verification mechanism to be reliable, trusting that the relayer won't play dead, trusting that message ordering/timeout handling won't cause issues, trusting that the target chain's execution won't be interrupted by strange permissions or upgrades... Bridges are more straightforward; often, they are just "multi-signature + operation," and how well they perform depends entirely on how things go on the day of a crisis.

By the way, there's a lively debate about NFT royalties: some want to take more, while others complain it affects liquidity; cross-chain is similar—security and user experience both want to be perfect, but in the end, whoever bears the trust cost usually suffers. Anyway, when I look at cross-chain now, I first ask myself: in the worst case, who am I actually trusting? Think it through before pressing the button; no rush even if the tea gets cold.