I think it was understood that with Pence, he was ok with the Impeachments, and the Democrats knew he would be weak if he took over from Trump.
That is not the case with Vance, which is why I believe they will not try any impeachment shenanigans with Trump this time.
Some on the left are already talking 14th Amendment and blocking Trump - regardless of election outcome today.
That’d be a direct coup.
The impeachments, in retrospect, were indirect coup attempts - mostly there to occupy time and effort and stop Trump from governing.