First, I don't know that this is actually the case.
If you don't know that that's actually the case, then why are you claiming that it's out of the ordinary to have witnesses? How can you make such a claim if you don't know what was done in the past? I know that that is actually the case, and I also know that that shows that you really don't care what past precedent is; you're just repeating talking points that FOX shoved down your throat.
Here's a list of the 19 past impeachment trials the senate has conducted before Trump.
Of those 19, 4 were halted before beginning of proceedings when three judges resigned and a fourth when the Senate realized it didn't have jurisdiction over impeaching its own senator (Blount).
Of the 15 that actually went to trial,
every single one of them had witnesses.
Most impeachments have been for egregious actions and there is little discussion. As for Presidential impeachments, there's been only two. The one modern precedent (Clinton) is being used here, and those witnesses were previously deposed.
So you are now admitting, despite your earlier post just minutes ago, that calling witnesses in Senate impeachment trials is
not "very unusual" and rather happened in both past Presidential impeachment trials. Whether they were deposed is entirely beside the point.
You yourself with this post have dispelled the notion that the Senate calling witnesses that previously didn't testify in front of the house is
not unusual. You're now moving the goalposts to claiming that the "unusualness" is only if the Senate subpoenas witnesses who haven't been previously deposed by the House. Yet if we want to look at past precedent, the Senate
has had witnesses in impeachment trials that weren't subpoenaed or deposed by the House. So your claim about precedent is both wrong and arbitrary.
You've shown yourself to be disingenuous.
Further, there is no reason that past precedent offers any kind of requirement for what the Senate does today. For example, out of the 15 past impeachments, not a single one only offered 24 hours for each side to argue their case. In fact, we can point to numerous Senate rules that break "past precedent". You're literally arguing against yourself here and you just don't care how contradictory you are.