Same thing with election fraud.

How would the 2020 election look any different if we knew for sure that there was election fraud?

It wouldn't look any different. They would refuse to do signature matching. They would stop the count when they're clearly about to lose so they have time to bring in the necessary amount of ballots to make up the difference. They would block observers from watching the count. They would adjudicate a large percentage of batches in key cities. They'd shred ballot envelopes (which is against the law) making it impossible to verify which ballots were actually mailed. They'd refuse to allow third party auditors to examine the voting machines. They'd do all of that and more to somehow pull off a miraculous victory that flies in the face of every historical indicator that all clearly pointed to them losing big time.