Central points of failure
As one of the most popular solutions to bridging blockchains is to require some level of trust this naturally brings the disadvantages of a single central point of control.
This could either be in the form of censorship of access or transaction, bad faith on the part of the central point of control (rug pull) or the vulnerability to external attack.
Increasing Complexity
In order to mitigate the difficulties presented by the Interoperability Trilemma bridging solutions are incorporating increasing levels of complexity. This can discourage crypto adoption as the user experience is too painful, as well as increase vectors resulting in the incidents like the Wormhole and Ronin hacks.
More Fees
Blockchain bridges are a service, and so have to charge fees to cover development costs and reward users who might be providing liquidity. Having to pay fees every time you make a cross-chain transaction may discourage adoption from a mainstream audience less concerned about principles like decentralisation and more focused on tangible cost and benefits.
There is no utopian solution to the problem of blockchain interoperability. Blockchain bridges will evolve and improve, and users migrate to the most convenient and cost-effective ways to leverage the full value of their crypto assets without being restricted to a single blockchain domain.
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