Your point is taken.
Here is the problem. If Joe Biden must be disqualified from holding office because of this, then likewise Trump should have to resign on principle.
The 2nd volume of Mueller's report details as many as 11 possible occurrences of obstruction of justice. You may recall that after the report had been released there was a letter circulating that had been signed by over 1200 federal and state prosecutors asserting that if they had been presented with this report for consideration they would have moved forward and prosecuted.
Defenders of the president were aghast. How could you prosecute the president for obstruction when there is no underlying crime? Obstruction needs no underlying crime. Similarly, The appearance of conflict of interest requires no underlying conflict of interest.
This is the problem when you turn a blind eye to the misconduct of a corrupt leader and impose no consequences. It sets a precedent. If President Trump was given a pass, Joe should gets one too (and all future POTUS and VPs too) So if you are one of those people who have justified ignoring the obstruction charges against the president based on the lack of evidence to support a conspiracy charge, then I don't want to see you calling foul for the appearance of conflict of interest.