Mueller report

I want to believe Mueller did the best he could. That he is honorable and truthful. But, I keep having these nagging thoughts about what we know so far. Either, I just don't understand the legalities or Barr ordered him to stop the investigation or something just isn't right. I believe I read that it wouldn't be fair because trump could not defend himself. ( it all runs together after a while). But trump can defend himself just as well if not better than any of us. Why couldn't Mueller have just recommended that trump be charged. Had he done at least that, we would not be in this dilemma. Why did he not say further investigation required or recommend charges against Kushner and jr. and Ivanka. I would welcome different views so I can try to better understand.