No, you are supposed to be able to put up a defense.
Who’s to say the jury is correct? What if the specialist made an assumption that was wrong, shared it with the jury, and found a person guilty because they trusted this expert. Now you have no way of challenging this, and rebutting the assumption.
You DON’T want those “independent thinker” jurors you need them to only consider what’s been presented in the case. It’s the only way it can be fair.