I really like and respect your takes but I also think you're living in some pre-2016 timeline where people can be politely convinced with reason and logic. So you seem to ignore this polarization that we are faced with and constant rebuttal of reality, so yes, I stand by my statement that in 2022, it is impossible to change anyone's mind when it comes to their position on Trump and the current GOP.
And while the committee's work might end up being irrelevant in terms of changing votes, you still have the (faint) possibility of criminal indictments being handed out. And anything that risks weakening the strength of the witness' testimony or attacking her character doesn't help.
They should have just stopped the hearing after the first half, yesterday. Would have been powerful enough.