You're speaking nonsense. What do you think Trump's lawyers were doing?
Mostly his lawyers were complaining about the injustice of the Democrats not allowing them to present a defense.
And Trump clearly blocked administration officials from testifying. That is simple fact which does not require a court case to determine.
True. But who says that Congress had the authority to call those witnesses in the first place?
The investigations were Congress' constitutionally mandated prerogative.
Trump blocked it. That's obstruction of a coequal branch of the gov't doing it's legal function.
Who says that is their legal function?
The gop toadies to Trump suborned justice and reason by acquitting him.
"Disagreeing with progressives about the extent of their authority and leaving it to the courts to sort out" is not even close to an impeachable offense.
But even if the President had actually gotten away with committing impeachable offenses, what right would the Democrats have to complain after they let Bill Clinton get away with all those felonies?