In the end, he did lay out several clear instances of obstruction that Trump would've likely been already charged with if he were not the sitting president - and left the door open for a few other charges.
"it is important to preserve evidence while memories are fresh and documents available"
-Mueller
Although he'll probably have a few 'get out of federal prison free' cards, I suspect Muellers findings will haunt Trump long after he leaves office.
Mueller's job was to uncover "Russian interference" AND investigate Russian collusion to which you had idiots like Adam Schiff, an elected official, not some left wing retard on Twitter, going on CNN every night promising everyone that the walls were closing in and that the President of the United States would be thrown in prison for being a Russian spy.
But let's take a step back, the entire Russia bullshit was started on the Steele Dossier which essentially was Russian disinformation that had no basis of being true. But apparently, that's all it takes to get a FISA warrant sign off at the Obama DoJ.
Read here where the U.S. IG released a report detailing pages of "errors" on behalf of the FBI which he designates as "incompetence" and not political animus - https://www.rollingstone.com/politics/political-commentary/horowitz-report-steele-dossier-collusion-news-media-924944/
I guess it is a high bar to prove legitimate political animus as the basis for the investigation but I also refuse to believe any government officials that choose to engage in FISA abuse are acting in good faith. Just my opinion, perhaps you might disagree with me and agree with Horowitz because Horowitz also seems to claim there was no bias on behalf of the FBI. Again, I find this hard to believe.
We knew of Russian interference since 2016. It did not take a special prosecutor to uncover it. This was an investigation on Trump. Had there been no smoke about Russian collusion, Mueller wouldn't have been appointed. He was appointed after firing Comey, and Sally Yates has even said Comey went "rogue" in regards to how Comey handled the Michael Flynn situation - https://www.cbsnews.com/news/sally-yates-comey-went-rogue-michael-flynn-senate-judiciary-committee/..So it's not like Trump was ever wrong for firing Comey in hindsight.