If my suspicion is right, that was one of the more spectacular political miscalculations in American history. If I'm wrong... well, maybe the DOJ was investigating and stuff, but from the outside it looks like they wasted a year that they really could have used.
That said, the Jan 6 prosecutions followed the traditional, deliberate bottom-up approach. The classified documents case was derailed by a maverick Trump judge but would eventually see a jury. The Georgia state charges were hamstrung by their chosen RICO path and Willis's ill-advised romantic entanglement. It could be that Biden and the DNC stayed out of it in a deliberate attempt to take the high road and/or avoid handing Trump a political defense.
On January 7 everyone thought Trump's political career was over and that he could only delay justice. Alas, he set up a very large inflation time bomb in 2020 and the rest is history.
Well it is relevant to your statement that neither party wants to see a president get convicted. And understanding there is some wiggle room in your exact phrasing, the dems presumably wouldn't have permitted or endorsed the prosecution if they didn't want a conviction.
> getting elected was all he needed
I mean, getting elected president of the United States is probably one of the hardest things to do. I don't like that he has immunity while holding office but the voters used their authority over the justice system to excuse him. It sucks, but it means the DOJ and Atlanta DA office didn't get their day in court. Well, DA Willis kinda shot herself in the foot, but that's beside the point.
> There's no evidence at all that said prosecution will resume
That doesn't change the fact that he was being prosecuted and in all likelihood would have been convicted of numerous felonies. None of the facts will change in four years except that Trump will either be dead or pardon himself.
> Even NIXON didn't actually get prosecuted for anything
He wasn't convicted because he was pardoned. This is a good example to your earlier point of the US not wanting to suffer the disgrace of a president being convicted. But that has limits that we witnessed with Trump. It's unfair to say the justice system won't hold presidents accountable when it doesn't actually get the opportunity due to a pardon from the executive or, in Trump's case, the will of the electorate.