Out of curiosity, did you watch any of the J6 committee hearings? I agree that most congressional hearings are a clown show for politcal gain. This one is different. As were the Watergate hearings.
The problem is: We, the public, have little information about the background of the events of J6. Mostly, that's good, because of ongoing criminal investigations. So, any window into the background is enlightening.
(Trying to stick to the criminal side of this, and avoid the polytics)
Since Georgia's Fani Willis is bound by Grand Jury rules, her criminal investigations into the events of several phone calls to election officials are under seal. For now. As is much of what the DOJ is doing. All we can follow is the prosecutions of the various criminals (there have been very few found innocent or dismissed, and most of that few have been under judges appointed by the former guy). And the Jan 6 comittee has transcripts, and transcripts, and transcripts... Some of those are damning, and some will help the defense lawyers. That's why they bear in depth examination.
And, they're about all that we the public have right now.
So, the only two windows into the background of the Jan 6 events are Trials, pre-trial motions and findings (Jon Eastman's long and winding email trail is an excellent example...), and the trials of the OathKeepers like Elmer Stuart Rhodes and his co-defendents (several of which were in the military "stack" of camo-clad rioters moving into the Capitol. There were a lot of guilty verdicts or pleadings this past year.
So, while I agree that congress rarely does "investigations" well, I am waiting with bated breath
for the HBLT hearings (WaPo has excellent coverage on those emails, but that won't stop the circus from happening),
IMHO: (after watching the hearings) The J6 committee has done a fair job of investigation. They hired quite a few good former federal prosecutors to conduct the nitty gritty, several with R after their names. The exposure of the laywer shenanigans around Cassiday Hutchin's testimony sheds a lot of light on what the opposition to the criminal proceedings are doing.
In 2023, I expect we'll see Fani Willis start making indictments (Grand Jury rules are "different" in Georgia, so the process is not exactly the same as the federal process). And
Special Counsel Jack Smith isn't afraid to sling subpoenas or fire off court filings/responses. This is going to be a fun year, between the clown show in the Capitol, and the way the investigations play out.