“It actually made a lot of sense. If Trump had been convicted in the Senate, they would have sought to disqualify him from holding Federal office again as the penalty.”
The ONLY point was to try to further tarnish Trump’s reputation in the public eye, but IMHO it actually enhanced it. Trump is Teflon - every single thing that he’s accused of falls by the wayside, as he’s innocent. It backs up his claim that, “They’re not after me, they’re after you; I’m just in the way.”
Read the link at 38.
Legally it probably would have been valid. See the other posts on this point. The CJ only presides over impeachment trials for sitting Presidents. By the time the Senate trial began, Trump was no longer President but was arguably subject to punishment beyond removal from office.