MPC means more verifications and approval are needed which might one of sacrifices service strengths.
MPC for an exchange means that the key used to sign transaction is computed from relevant shares stored on different servers
which operate independently from one another but still belong to the same company. It’s much harder to compromise all of those servers at once than the single server. As for the speed of approvals, nothing would change significantly as all the computation required to construct the key happens within milliseconds.
