I find it very frustrating that intelligent people don't seem to follow through their thought process here.
The intelligence community will never be able to release enough information to satisfy people. The information will either be so non-specific as to be useless ("we had spies who told us" - would anyone here believe that anymore than they do now?), or so specific it will damage ongoing interests ("We have communication intercepts between the hacking groups and the GRU/FSB, and there they are, and here is how we got them" - it's likely there are actual humans involved in that process who will die if they are exposed).
It's fair to argue that this issue is so important that burning some resources is worth it, but no one is taking that angle.
Don't mistake this for defending the US report though. It was terrible and made the situation much more confused. Before the report it was much clearer that Russian groups (either government or non-government) were involved, and now people are (incorrectly) questioning even that because of the pathetic report that was produced.
It's much more interesting to discuss the shared conclusion was formed that "the Russians" were trying to throw the election to Trump (rather than just to sow chaos).