Mueller did not seek charges for attempted obstruction or other lesser charges.
That's up to the DOJ.
Mueller was not tasked with that. That is up to the DOJ and later, Congress.
You also cannot indict a sitting POTUS, that is what Congress is for.
We've seen 2 modern impeachments play out on lesser charges that come from an initially blacked out report.
We will probably see the same thing happen, right around election time. If I were the POTUS, I would get this out in the open NOW because an impeachment hearing in 2020 will be killer.
As an aside, if I were innocent, I would let the whole report about me out.