What more do you expect Congress to do at this point? The meat of the evidence-gathering is happening in the Executive Branch with DOJ because it is their wheelhouse, not that of the Legislative Branch. 
Congress (both chambers) has been having ongoing hearings since the insurrection happened and that included a 2nd impeachment directly associated with the insurrection, with the actual Article of Impeachment explicitly referencing "Inciting an Insurrection". And this "Commission" is nothing more than an additional "informational tool" that will inform them on what type of legislation might be needed as a result of what happened.
I wouldn't put much value on what a "Commission" comes up with but would rather watch what is happening with DOJ as AG Garland (or Pres. Biden) would be the one(s) who in future, could appoint a "Special Counsel" to do a true "criminal" investigation. I expect that may be coming.
Edit history
= new reply since forum marked as read
