Why would it be more disastrous than last time? (Asking as I'm not well enough educated to know)
Because last time he thought he could be like in his businesses - what he said went. When people starting saying no, or the law won't let you, he got arsey.
He's not willing to let that happen this time. He (or at least his team) are basically going to purge all sorts of officials, judges, lawyers etc. to fit in his rabid loyalists. It'll basically be like Johnson's 2019 intake only far worse and far less intelligent. He's openly said that ' when' he wins he's going after them. He basically sees them as traitors. He got lucky in that he got to appoint 1/3 of the Supreme Court, so he does potentially have a basis to start subverting and changing the laws. They've already stated that a president should be immune from prosecution so that's already started.