The reason Iām against drivechain is that it creates additional incentives for miner centralization.
Today, a 51% attacker canāt take your coins other than rewriting history back to before you got them. But under drivechain, a 51% attacker can sweep sidechain coins by building blocks forward (no history rewrite necessary).
In addition, even in the absence of a 51% attacker, miners vote on which chains to activate/deactivate. This gives great power to mining pool operators who command voting hash. Switching pools, rather than being a purely economic choice, would become a political choiceāthat is, picking a pool that votes the way you want to for sidechain activation/deactivation.
