Bench trial was specified by the defendant's counsel, essentially concluded before defendant ever set foot in the courtroom, the judgement of culpability for fraud rendered based on the content of defendant's own paperwork, witness statements. The alleged "show trial" where defendant was actually present was essentially penalty assessment, hence the reason Engoron revised his preliminary judgement. You should pay attention to what's actually happening rather than operating on imagination, personal bias.
But let's dig into your claim of "show trial"; Engoron made his bench decision based primarily on subpoenaed documentation rendered by the defendant. Either defendant rendered false documentation, subsequently was found liable based on said false documentation or defendant rendered accurate documentation, was found liable based on said accurate documentation.
Sooo... if it's the former, that's a new can of worms because defendant committed documents fraud and is criminally liable, subject to imprisonment. If it's the latter, defendant is only civilly liable for monetary damages, restrictions resultant from the NYAG's suit, not subject to imprisonment. And either way, it's a fate of his own making. By his own accounting, Trump doesn't make mistakes so which would you rather?