Do you believe expert witnesses assist the jury in understanding and evaluating complex concepts or just spin the facts to support the position of the side that hired them?

General Information About Expert Witnesses and Consultants
FBI admits crime lab wrong testimony

A good recent example of a battle of the experts in State vs. Chauvin. I don’t want to go into the case itself’ but based on the article above, can you see how one side relied on one set of results and the other side relied on the other?
How might the jury in deliberation have decided which side came to the correct results? Do you believe expert witnesses assist the jury in understanding and evaluating complex concepts or just spin the facts to support the position of the side that hired them?
Do you think juries place too much emphasis on their opinions, or can average jurors effectively assess their credibility and weigh their testimony for what it’s worth?
Do you think enough is being done to keep “junk science” out of criminal trials?