This is indeed an interesting perspective on the challenges associated with using Bitcoin for security in PoS chains and the innovative solution proposed by Babylon's staking protocol. It's clear that bridging to 3rd party custodians has its security risks, and Babylon's approach to address this issue without the need for such bridges is a promising development.
Furthermore, the idea of introducing slashing as a penalty for malicious stakers in the absence of smart contracts in Bitcoin is a noteworthy innovation. It's important to maintain the integrity of PoS chains and hold malicious actors accountable.
Overall, the Babylon team's work is a step in the right direction for improving the security and functionality of PoS chains, and I'm eager to see how this protocol evolves and contributes to the blockchain ecosystem.